55631199 has 16 divisors (see below), whose sum is σ = 80242400. Its totient is φ = 34079616.

The previous prime is 55631197. The next prime is 55631201. The reversal of 55631199 is 99113655.

It is an interprime number because it is at equal distance from previous prime (55631197) and next prime (55631201).

It is not a de Polignac number, because 55631199 - 2¹ = 55631197 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55631197) 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, 5817 + ... + 12045.

It is an arithmetic number, because the mean of its divisors is an integer number (5015150).

Almost surely, 2^55631199 is an apocalyptic number.

55631199 is a deficient number, since it is larger than the sum of its proper divisors (24611201).

55631199 is a wasteful number, since it uses less digits than its factorization.

55631199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6474.

The product of its digits is 36450, while the sum is 39.

The square root of 55631199 is about 7458.6325154146. The cubic root of 55631199 is about 381.7445159006.

The spelling of 55631199 in words is "fifty-five million, six hundred thirty-one thousand, one hundred ninety-nine".