55647731 has 4 divisors (see below), whose sum is σ = 55681752. Its totient is φ = 55613712.

The previous prime is 55647727. The next prime is 55647733. The reversal of 55647731 is 13774655.

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 55647731 - 2² = 55647727 is a prime.

It is a super-2 number, since 2×55647731² = 6193339930896722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55647733) 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, 14426 + ... + 17871.

It is an arithmetic number, because the mean of its divisors is an integer number (13920438).

Almost surely, 2^55647731 is an apocalyptic number.

55647731 is a deficient number, since it is larger than the sum of its proper divisors (34021).

55647731 is a wasteful number, since it uses less digits than its factorization.

55647731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34020.

The product of its digits is 88200, while the sum is 38.

The square root of 55647731 is about 7459.7406791389. The cubic root of 55647731 is about 381.7823266698.

The spelling of 55647731 in words is "fifty-five million, six hundred forty-seven thousand, seven hundred thirty-one".