55664131 has 2 divisors, whose sum is σ = 55664132. Its totient is φ = 55664130.

The previous prime is 55664107. The next prime is 55664143. The reversal of 55664131 is 13146655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55664131 - 2⁵ = 55664099 is a prime.

It is a super-2 number, since 2×55664131² = 6196990959970322, which contains 22 as substring.

It is equal to p_3319438 and since 55664131 and 3319438 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 55664093 and 55664102.

It is not a weakly prime, because it can be changed into another prime (55664431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27832065 + 27832066.

It is an arithmetic number, because the mean of its divisors is an integer number (27832066).

Almost surely, 2^55664131 is an apocalyptic number.

55664131 is a deficient number, since it is larger than the sum of its proper divisors (1).

55664131 is an equidigital number, since it uses as much as digits as its factorization.

55664131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

The square root of 55664131 is about 7460.8398320832. The cubic root of 55664131 is about 381.8198281400.

The spelling of 55664131 in words is "fifty-five million, six hundred sixty-four thousand, one hundred thirty-one".