55698631 has 4 divisors (see below), whose sum is σ = 56993992. Its totient is φ = 54403272.

The previous prime is 55698611. The next prime is 55698637. The reversal of 55698631 is 13689655.

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 55698631 - 2¹⁷ = 55567559 is a prime.

It is a super-2 number, since 2×55698631² = 6204674990548322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1295317 = 55698631 / (5 + 5 + 6 + 9 + 8 + 6 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55698637) 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, 647616 + ... + 647701.

It is an arithmetic number, because the mean of its divisors is an integer number (14248498).

Almost surely, 2^55698631 is an apocalyptic number.

55698631 is a deficient number, since it is larger than the sum of its proper divisors (1295361).

55698631 is a wasteful number, since it uses less digits than its factorization.

55698631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295360.

The product of its digits is 194400, while the sum is 43.

The square root of 55698631 is about 7463.1515460963. The cubic root of 55698631 is about 381.8986943885.

The spelling of 55698631 in words is "fifty-five million, six hundred ninety-eight thousand, six hundred thirty-one".