139257311 has 4 divisors (see below), whose sum is σ = 139389624. Its totient is φ = 139125000.

The previous prime is 139257299. The next prime is 139257347. The reversal of 139257311 is 113752931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113752931 = 43 ⋅2645417.

It is a cyclic number.

It is not a de Polignac number, because 139257311 - 2¹⁰ = 139256287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139257211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64565 + ... + 66686.

It is an arithmetic number, because the mean of its divisors is an integer number (34847406).

Almost surely, 2^139257311 is an apocalyptic number.

139257311 is a deficient number, since it is larger than the sum of its proper divisors (132313).

139257311 is a wasteful number, since it uses less digits than its factorization.

139257311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132312.

The product of its digits is 5670, while the sum is 32.

The square root of 139257311 is about 11800.7334941520. The cubic root of 139257311 is about 518.3295892957.

The spelling of 139257311 in words is "one hundred thirty-nine million, two hundred fifty-seven thousand, three hundred eleven".