55530491 has 2 divisors, whose sum is σ = 55530492. Its totient is φ = 55530490.

The previous prime is 55530481. The next prime is 55530499. The reversal of 55530491 is 19403555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55530491 is a prime.

It is not a weakly prime, because it can be changed into another prime (55530499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27765245 + 27765246.

It is an arithmetic number, because the mean of its divisors is an integer number (27765246).

Almost surely, 2^55530491 is an apocalyptic number.

55530491 is a deficient number, since it is larger than the sum of its proper divisors (1).

55530491 is an equidigital number, since it uses as much as digits as its factorization.

55530491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 55530491 is about 7451.8783538112. The cubic root of 55530491 is about 381.5140220451.

The spelling of 55530491 in words is "fifty-five million, five hundred thirty thousand, four hundred ninety-one".