139043557 has 2 divisors, whose sum is σ = 139043558. Its totient is φ = 139043556.

The previous prime is 139043519. The next prime is 139043599. The reversal of 139043557 is 755340931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139027681 + 15876 = 11791^2 + 126^2 .

It is a cyclic number.

It is not a de Polignac number, because 139043557 - 2²³ = 130654949 is a prime.

It is a super-2 number, since 2×139043557² = 38666221486424498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139043057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69521778 + 69521779.

It is an arithmetic number, because the mean of its divisors is an integer number (69521779).

Almost surely, 2^139043557 is an apocalyptic number.

It is an amenable number.

139043557 is a deficient number, since it is larger than the sum of its proper divisors (1).

139043557 is an equidigital number, since it uses as much as digits as its factorization.

139043557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 139043557 is about 11791.6732061230. The cubic root of 139043557 is about 518.0642489241.

The spelling of 139043557 in words is "one hundred thirty-nine million, forty-three thousand, five hundred fifty-seven".