55406591 has 2 divisors, whose sum is σ = 55406592. Its totient is φ = 55406590.

The previous prime is 55406573. The next prime is 55406599. The reversal of 55406591 is 19560455.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55406591 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55406599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27703295 + 27703296.

It is an arithmetic number, because the mean of its divisors is an integer number (27703296).

Almost surely, 2^55406591 is an apocalyptic number.

55406591 is a deficient number, since it is larger than the sum of its proper divisors (1).

55406591 is an equidigital number, since it uses as much as digits as its factorization.

55406591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 55406591 is about 7443.5603712202. The cubic root of 55406591 is about 381.2300652123.

The spelling of 55406591 in words is "fifty-five million, four hundred six thousand, five hundred ninety-one".