55623531 has 8 divisors (see below), whose sum is σ = 74211904. Its totient is φ = 37058760.

The previous prime is 55623527. The next prime is 55623569. The reversal of 55623531 is 13532655.

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

It is not a de Polignac number, because 55623531 - 2² = 55623527 is a prime.

It is a super-2 number, since 2×55623531² = 6187954401815922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55623731) 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, 636 + ... + 10566.

It is an arithmetic number, because the mean of its divisors is an integer number (9276488).

Almost surely, 2^55623531 is an apocalyptic number.

55623531 is a deficient number, since it is larger than the sum of its proper divisors (18588373).

55623531 is a wasteful number, since it uses less digits than its factorization.

55623531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11801.

The product of its digits is 13500, while the sum is 30.

The square root of 55623531 is about 7458.1184624542. The cubic root of 55623531 is about 381.7269756743.

The spelling of 55623531 in words is "fifty-five million, six hundred twenty-three thousand, five hundred thirty-one".