97809691 has 4 divisors (see below), whose sum is σ = 111782512. Its totient is φ = 83836872.

The previous prime is 97809661. The next prime is 97809703. The reversal of 97809691 is 19690879.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 97809691 - 2¹³ = 97801499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97809601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6986400 + ... + 6986413.

It is an arithmetic number, because the mean of its divisors is an integer number (27945628).

Almost surely, 2^97809691 is an apocalyptic number.

97809691 is a deficient number, since it is larger than the sum of its proper divisors (13972821).

97809691 is a wasteful number, since it uses less digits than its factorization.

97809691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13972820.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 97809691 is about 9889.8782095636. The cubic root of 97809691 is about 460.7449978834.

The spelling of 97809691 in words is "ninety-seven million, eight hundred nine thousand, six hundred ninety-one".