139497021049 has 9 divisors (see below), whose sum is σ = 140560127877. Its totient is φ = 138441903324.

The previous prime is 139497021031. The next prime is 139497021061. The reversal of 139497021049 is 940120794931.

The square root of 139497021049 is 373493.

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

It is not a de Polignac number, because 139497021049 - 2⁵ = 139497021017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139497020993 and 139497021011.

It is not an unprimeable number, because it can be changed into a prime (139497021029) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 51914184 + ... + 51916870.

Almost surely, 2^139497021049 is an apocalyptic number.

139497021049 is the 373493-rd square number.

139497021049 is the 186747-th centered octagonal number.

It is an amenable number.

139497021049 is a deficient number, since it is larger than the sum of its proper divisors (1063106828).

139497021049 is an frugal number, since it uses more digits than its factorization.

139497021049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5652 (or 2826 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

Multiplying 139497021049 by its sum of digits (49), we get a square (6835354031401 = 2614451²).

The spelling of 139497021049 in words is "one hundred thirty-nine billion, four hundred ninety-seven million, twenty-one thousand, forty-nine".