56081999 has 2 divisors, whose sum is σ = 56082000. Its totient is φ = 56081998.

The previous prime is 56081959. The next prime is 56082001. The reversal of 56081999 is 99918065.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56081999 - 2¹⁶ = 56016463 is a prime.

It is a super-2 number, since 2×56081999² = 6290381223672002, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 56082001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56081959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28040999 + 28041000.

It is an arithmetic number, because the mean of its divisors is an integer number (28041000).

Almost surely, 2^56081999 is an apocalyptic number.

56081999 is a deficient number, since it is larger than the sum of its proper divisors (1).

56081999 is an equidigital number, since it uses as much as digits as its factorization.

56081999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 56081999 is about 7488.7915580553. The cubic root of 56081999 is about 382.7728817275.

The spelling of 56081999 in words is "fifty-six million, eighty-one thousand, nine hundred ninety-nine".