56138861 has 4 divisors (see below), whose sum is σ = 57949824. Its totient is φ = 54327900.

The previous prime is 56138857. The next prime is 56138869. The reversal of 56138861 is 16883165.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56138861 - 2² = 56138857 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 (56138869) 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, 905435 + ... + 905496.

It is an arithmetic number, because the mean of its divisors is an integer number (14487456).

Almost surely, 2^56138861 is an apocalyptic number.

It is an amenable number.

56138861 is a deficient number, since it is larger than the sum of its proper divisors (1810963).

56138861 is a wasteful number, since it uses less digits than its factorization.

56138861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810962.

The product of its digits is 34560, while the sum is 38.

The square root of 56138861 is about 7492.5870698978. The cubic root of 56138861 is about 382.9022035548.

The spelling of 56138861 in words is "fifty-six million, one hundred thirty-eight thousand, eight hundred sixty-one".