55051631 has 2 divisors, whose sum is σ = 55051632. Its totient is φ = 55051630.

The previous prime is 55051603. The next prime is 55051637. The reversal of 55051631 is 13615055.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55051631 is a prime.

It is a super-2 number, since 2×55051631² = 6061364151520322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55051631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55051637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27525815 + 27525816.

It is an arithmetic number, because the mean of its divisors is an integer number (27525816).

Almost surely, 2^55051631 is an apocalyptic number.

55051631 is a deficient number, since it is larger than the sum of its proper divisors (1).

55051631 is an equidigital number, since it uses as much as digits as its factorization.

55051631 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 26.

The square root of 55051631 is about 7419.6786318546. The cubic root of 55051631 is about 380.4142090031.

Adding to 55051631 its reverse (13615055), we get a palindrome (68666686).

The spelling of 55051631 in words is "fifty-five million, fifty-one thousand, six hundred thirty-one".