55578311 has 2 divisors, whose sum is σ = 55578312. Its totient is φ = 55578310.

The previous prime is 55578307. The next prime is 55578323. The reversal of 55578311 is 11387555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55578311 - 2² = 55578307 is a prime.

It is a super-2 number, since 2×55578311² = 6177897307225442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55578301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27789155 + 27789156.

It is an arithmetic number, because the mean of its divisors is an integer number (27789156).

Almost surely, 2^55578311 is an apocalyptic number.

55578311 is a deficient number, since it is larger than the sum of its proper divisors (1).

55578311 is an equidigital number, since it uses as much as digits as its factorization.

55578311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 35.

The square root of 55578311 is about 7455.0862503394. The cubic root of 55578311 is about 381.6235040358.

The spelling of 55578311 in words is "fifty-five million, five hundred seventy-eight thousand, three hundred eleven".