55097591 has 2 divisors, whose sum is σ = 55097592. Its totient is φ = 55097590.

The previous prime is 55097543. The next prime is 55097599. The reversal of 55097591 is 19579055.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55097591 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55097599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27548795 + 27548796.

It is an arithmetic number, because the mean of its divisors is an integer number (27548796).

Almost surely, 2^55097591 is an apocalyptic number.

55097591 is a deficient number, since it is larger than the sum of its proper divisors (1).

55097591 is an equidigital number, since it uses as much as digits as its factorization.

55097591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70875, while the sum is 41.

The square root of 55097591 is about 7422.7751548865. The cubic root of 55097591 is about 380.5200428268.

The spelling of 55097591 in words is "fifty-five million, ninety-seven thousand, five hundred ninety-one".