139496521 has 2 divisors, whose sum is σ = 139496522. Its totient is φ = 139496520.

The previous prime is 139496471. The next prime is 139496557. The reversal of 139496521 is 125694931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97713225 + 41783296 = 9885^2 + 6464^2 .

It is a cyclic number.

It is not a de Polignac number, because 139496521 - 2⁹ = 139496009 is a prime.

It is a super-2 number, since 2×139496521² = 38918558742206882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139496321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69748260 + 69748261.

It is an arithmetic number, because the mean of its divisors is an integer number (69748261).

Almost surely, 2^139496521 is an apocalyptic number.

It is an amenable number.

139496521 is a deficient number, since it is larger than the sum of its proper divisors (1).

139496521 is an equidigital number, since it uses as much as digits as its factorization.

139496521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 139496521 is about 11810.8645322855. The cubic root of 139496521 is about 518.6262073410.

The spelling of 139496521 in words is "one hundred thirty-nine million, four hundred ninety-six thousand, five hundred twenty-one".