97557091 has 2 divisors, whose sum is σ = 97557092. Its totient is φ = 97557090.

The previous prime is 97557079. The next prime is 97557107. The reversal of 97557091 is 19075579.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97557091 is a prime.

It is not a weakly prime, because it can be changed into another prime (97557391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48778545 + 48778546.

It is an arithmetic number, because the mean of its divisors is an integer number (48778546).

Almost surely, 2^97557091 is an apocalyptic number.

97557091 is a deficient number, since it is larger than the sum of its proper divisors (1).

97557091 is an equidigital number, since it uses as much as digits as its factorization.

97557091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 99225, while the sum is 43.

The square root of 97557091 is about 9877.0993211570. The cubic root of 97557091 is about 460.3480211311.

The spelling of 97557091 in words is "ninety-seven million, five hundred fifty-seven thousand, ninety-one".