55981307 has 2 divisors, whose sum is σ = 55981308. Its totient is φ = 55981306.

The previous prime is 55981273. The next prime is 55981327. The reversal of 55981307 is 70318955.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55981307 - 2¹⁰ = 55980283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55981327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27990653 + 27990654.

It is an arithmetic number, because the mean of its divisors is an integer number (27990654).

Almost surely, 2^55981307 is an apocalyptic number.

55981307 is a deficient number, since it is larger than the sum of its proper divisors (1).

55981307 is an equidigital number, since it uses as much as digits as its factorization.

55981307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 55981307 is about 7482.0656907033. The cubic root of 55981307 is about 382.5436622663.

The spelling of 55981307 in words is "fifty-five million, nine hundred eighty-one thousand, three hundred seven".