55621631 has 8 divisors (see below), whose sum is σ = 60270000. Its totient is φ = 51026112.

The previous prime is 55621627. The next prime is 55621649. The reversal of 55621631 is 13612655.

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

It is a cyclic number.

It is not a de Polignac number, because 55621631 - 2² = 55621627 is a prime.

It is a super-2 number, since 2×55621631² = 6187531670200322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55621594 and 55621603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55621031) 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, 11006 + ... + 15243.

It is an arithmetic number, because the mean of its divisors is an integer number (7533750).

Almost surely, 2^55621631 is an apocalyptic number.

55621631 is a deficient number, since it is larger than the sum of its proper divisors (4648369).

55621631 is a wasteful number, since it uses less digits than its factorization.

55621631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26425.

The product of its digits is 5400, while the sum is 29.

The square root of 55621631 is about 7457.9910833950. The cubic root of 55621631 is about 381.7226292553.

The spelling of 55621631 in words is "fifty-five million, six hundred twenty-one thousand, six hundred thirty-one".