56139911 has 4 divisors (see below), whose sum is σ = 58075800. Its totient is φ = 54204024.

The previous prime is 56139907. The next prime is 56139931. The reversal of 56139911 is 11993165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11993165 = 5 ⋅2398633.

It is a cyclic number.

It is not a de Polignac number, because 56139911 - 2² = 56139907 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 (56139931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 967901 + ... + 967958.

It is an arithmetic number, because the mean of its divisors is an integer number (14518950).

Almost surely, 2^56139911 is an apocalyptic number.

56139911 is a deficient number, since it is larger than the sum of its proper divisors (1935889).

56139911 is a wasteful number, since it uses less digits than its factorization.

56139911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935888.

The product of its digits is 7290, while the sum is 35.

The square root of 56139911 is about 7492.6571388260. The cubic root of 56139911 is about 382.9045907592.

The spelling of 56139911 in words is "fifty-six million, one hundred thirty-nine thousand, nine hundred eleven".