55731 has 8 divisors (see below), whose sum is σ = 80080. Its totient is φ = 34272.

The previous prime is 55721. The next prime is 55733. The reversal of 55731 is 13755.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55731 - 2⁶ = 55667 is a prime.

It is a super-2 number, since 2×55731² = 6211888722, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 55698 and 55707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676 + ... + 753.

It is an arithmetic number, because the mean of its divisors is an integer number (10010).

2⁵⁵⁷³¹ is an apocalyptic number.

55731 is a deficient number, since it is larger than the sum of its proper divisors (24349).

55731 is a wasteful number, since it uses less digits than its factorization.

55731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445.

The product of its digits is 525, while the sum is 21.

The square root of 55731 is about 236.0741408965. The cubic root of 55731 is about 38.1972659611.

The spelling of 55731 in words is "fifty-five thousand, seven hundred thirty-one".