139292421961 has 81 divisors (see below), whose sum is σ = 184455213831. Its totient is φ = 104799895200.

The previous prime is 139292421949. The next prime is 139292421979. The reversal of 139292421961 is 169124292931.

It is a happy number.

The square root of 139292421961 is 373219.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 124640772025 + 14651649936 = 353045^2 + 121044^2 .

It is not a de Polignac number, because 139292421961 - 2⁷ = 139292421833 is a prime.

It is a super-2 number, since 2×139292421961² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (139292421941) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1063300866 + ... + 1063300996.

Almost surely, 2^139292421961 is an apocalyptic number.

139292421961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139292421961 is the 373219-th square number.

139292421961 is the 186610-th centered octagonal number.

It is an amenable number.

139292421961 is a deficient number, since it is larger than the sum of its proper divisors (45162791870).

139292421961 is an equidigital number, since it uses as much as digits as its factorization.

139292421961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 186 counting only the distinct ones).

The product of its digits is 419904, while the sum is 49.

Multiplying 139292421961 by its sum of digits (49), we get a square (6825328676089 = 2612533²).

139292421961 divided by its sum of digits (49) gives a square (2842702489 = 53317²).

The spelling of 139292421961 in words is "one hundred thirty-nine billion, two hundred ninety-two million, four hundred twenty-one thousand, nine hundred sixty-one".