97557691 has 16 divisors (see below), whose sum is σ = 121870080. Its totient is φ = 75869280.

The previous prime is 97557689. The next prime is 97557703. The reversal of 97557691 is 19675579.

It is a cyclic number.

It is not a de Polignac number, because 97557691 - 2¹ = 97557689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97557661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53700 + ... + 55486.

It is an arithmetic number, because the mean of its divisors is an integer number (7616880).

Almost surely, 2^97557691 is an apocalyptic number.

97557691 is a deficient number, since it is larger than the sum of its proper divisors (24312389).

97557691 is a wasteful number, since it uses less digits than its factorization.

97557691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2514.

The product of its digits is 595350, while the sum is 49.

The square root of 97557691 is about 9877.1296944001. The cubic root of 97557691 is about 460.3489648802.

The spelling of 97557691 in words is "ninety-seven million, five hundred fifty-seven thousand, six hundred ninety-one".