56155691 has 4 divisors (see below), whose sum is σ = 57525384. Its totient is φ = 54786000.

The previous prime is 56155667. The next prime is 56155699. The reversal of 56155691 is 19655165.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56155691 - 2¹⁰ = 56154667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56155699) 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, 684785 + ... + 684866.

It is an arithmetic number, because the mean of its divisors is an integer number (14381346).

Almost surely, 2^56155691 is an apocalyptic number.

56155691 is a deficient number, since it is larger than the sum of its proper divisors (1369693).

56155691 is a wasteful number, since it uses less digits than its factorization.

56155691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369692.

The product of its digits is 40500, while the sum is 38.

The square root of 56155691 is about 7493.7100958070. The cubic root of 56155691 is about 382.9404634464.

The spelling of 56155691 in words is "fifty-six million, one hundred fifty-five thousand, six hundred ninety-one".