55780831 has 2 divisors, whose sum is σ = 55780832. Its totient is φ = 55780830.

The previous prime is 55780817. The next prime is 55780843. The reversal of 55780831 is 13808755.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55780831 - 2⁵ = 55780799 is a prime.

It is a super-2 number, since 2×55780831² = 6223002214101122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55780861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27890415 + 27890416.

It is an arithmetic number, because the mean of its divisors is an integer number (27890416).

Almost surely, 2^55780831 is an apocalyptic number.

55780831 is a deficient number, since it is larger than the sum of its proper divisors (1).

55780831 is an equidigital number, since it uses as much as digits as its factorization.

55780831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 55780831 is about 7468.6565726374. The cubic root of 55780831 is about 382.0864706526.

The spelling of 55780831 in words is "fifty-five million, seven hundred eighty thousand, eight hundred thirty-one".