55641331 has 2 divisors, whose sum is σ = 55641332. Its totient is φ = 55641330.

The previous prime is 55641293. The next prime is 55641349. The reversal of 55641331 is 13314655.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55641331 is a prime.

It is a super-2 number, since 2×55641331² = 6191915430903122, which contains 22 as substring.

It is equal to p_3318166 and since 55641331 and 3318166 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55641331.

It is not a weakly prime, because it can be changed into another prime (55641371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27820665 + 27820666.

It is an arithmetic number, because the mean of its divisors is an integer number (27820666).

Almost surely, 2^55641331 is an apocalyptic number.

55641331 is a deficient number, since it is larger than the sum of its proper divisors (1).

55641331 is an equidigital number, since it uses as much as digits as its factorization.

55641331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 55641331 is about 7459.3116974691. The cubic root of 55641331 is about 381.7676899511.

Adding to 55641331 its reverse (13314655), we get a palindrome (68955986).

The spelling of 55641331 in words is "fifty-five million, six hundred forty-one thousand, three hundred thirty-one".