55731731 has 16 divisors (see below), whose sum is σ = 65736960. Its totient is φ = 46694880.

The previous prime is 55731721. The next prime is 55731733. The reversal of 55731731 is 13713755.

It is a cyclic number.

It is not a de Polignac number, because 55731731 - 2⁶ = 55731667 is a prime.

It is a super-2 number, since 2×55731731² = 6212051680512722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55731733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4130 + ... + 11336.

It is an arithmetic number, because the mean of its divisors is an integer number (4108560).

Almost surely, 2^55731731 is an apocalyptic number.

55731731 is a deficient number, since it is larger than the sum of its proper divisors (10005229).

55731731 is a wasteful number, since it uses less digits than its factorization.

55731731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7274.

The product of its digits is 11025, while the sum is 32.

The square root of 55731731 is about 7465.3687785668. The cubic root of 55731731 is about 381.9743296621.

The spelling of 55731731 in words is "fifty-five million, seven hundred thirty-one thousand, seven hundred thirty-one".