97157691 has 16 divisors (see below), whose sum is σ = 144103200. Its totient is φ = 64697184.

The previous prime is 97157677. The next prime is 97157699. The reversal of 97157691 is 19675179.

97157691 is a `hidden beast` number, since 9 + 71 + 576 + 9 + 1 = 666.

It is not a de Polignac number, because 97157691 - 2¹³ = 97149499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97157699) 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 in 15 ways as a sum of consecutive naturals, for example, 31945 + ... + 34853.

It is an arithmetic number, because the mean of its divisors is an integer number (9006450).

Almost surely, 2^97157691 is an apocalyptic number.

97157691 is a deficient number, since it is larger than the sum of its proper divisors (46945509).

97157691 is a wasteful number, since it uses less digits than its factorization.

97157691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155 (or 4149 counting only the distinct ones).

The product of its digits is 119070, while the sum is 45.

The square root of 97157691 is about 9856.8600984289. The cubic root of 97157691 is about 459.7189382611.

The spelling of 97157691 in words is "ninety-seven million, one hundred fifty-seven thousand, six hundred ninety-one".