55005631 has 2 divisors, whose sum is σ = 55005632. Its totient is φ = 55005630.

The previous prime is 55005623. The next prime is 55005653. The reversal of 55005631 is 13650055.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55005631 - 2³ = 55005623 is a prime.

It is a super-2 number, since 2×55005631² = 6051238883416322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55005596 and 55005605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55005131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27502815 + 27502816.

It is an arithmetic number, because the mean of its divisors is an integer number (27502816).

Almost surely, 2^55005631 is an apocalyptic number.

55005631 is a deficient number, since it is larger than the sum of its proper divisors (1).

55005631 is an equidigital number, since it uses as much as digits as its factorization.

55005631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 55005631 is about 7416.5781193216. The cubic root of 55005631 is about 380.3082240728.

Adding to 55005631 its reverse (13650055), we get a palindrome (68655686).

The spelling of 55005631 in words is "fifty-five million, five thousand, six hundred thirty-one".