55919491 has 2 divisors, whose sum is σ = 55919492. Its totient is φ = 55919490.

The previous prime is 55919483. The next prime is 55919503. The reversal of 55919491 is 19491955.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55919491 - 2³ = 55919483 is a prime.

It is not a weakly prime, because it can be changed into another prime (55919401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27959745 + 27959746.

It is an arithmetic number, because the mean of its divisors is an integer number (27959746).

Almost surely, 2^55919491 is an apocalyptic number.

55919491 is a deficient number, since it is larger than the sum of its proper divisors (1).

55919491 is an equidigital number, since it uses as much as digits as its factorization.

55919491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 43.

The square root of 55919491 is about 7477.9336049473. The cubic root of 55919491 is about 382.4028055552.

The spelling of 55919491 in words is "fifty-five million, nine hundred nineteen thousand, four hundred ninety-one".