55408907 has 2 divisors, whose sum is σ = 55408908. Its totient is φ = 55408906.

The previous prime is 55408901. The next prime is 55408961. The reversal of 55408907 is 70980455.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55408907 is a prime.

It is not a weakly prime, because it can be changed into another prime (55408901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27704453 + 27704454.

It is an arithmetic number, because the mean of its divisors is an integer number (27704454).

Almost surely, 2^55408907 is an apocalyptic number.

55408907 is a deficient number, since it is larger than the sum of its proper divisors (1).

55408907 is an equidigital number, since it uses as much as digits as its factorization.

55408907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 55408907 is about 7443.7159403083. The cubic root of 55408907 is about 381.2353769541.

The spelling of 55408907 in words is "fifty-five million, four hundred eight thousand, nine hundred seven".