139393956025 has 27 divisors (see below), whose sum is σ = 175021051501. Its totient is φ = 110130764480.

The previous prime is 139393956017. The next prime is 139393956113. The reversal of 139393956025 is 520659393931.

The square root of 139393956025 is 373355.

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

It can be written as a sum of positive squares in 4 ways, for example, as 29007880489 + 110386075536 = 170317^2 + 332244^2 .

It is not a de Polignac number, because 139393956025 - 2³ = 139393956017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 166142556 + ... + 166143394.

Almost surely, 2^139393956025 is an apocalyptic number.

139393956025 is the 373355-th square number.

139393956025 is the 186678-th centered octagonal number.

It is an amenable number.

139393956025 is a deficient number, since it is larger than the sum of its proper divisors (35627095476).

139393956025 is an frugal number, since it uses more digits than its factorization.

139393956025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 5904900, while the sum is 55.

The spelling of 139393956025 in words is "one hundred thirty-nine billion, three hundred ninety-three million, nine hundred fifty-six thousand, twenty-five".