971604491 has 24 divisors (see below), whose sum is σ = 1151933760. Its totient is φ = 812354400.

The previous prime is 971604461. The next prime is 971604493. The reversal of 971604491 is 194406179.

It is not a de Polignac number, because 971604491 - 2¹⁸ = 971342347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (971604493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 614540 + ... + 616118.

It is an arithmetic number, because the mean of its divisors is an integer number (47997240).

Almost surely, 2^971604491 is an apocalyptic number.

971604491 is a deficient number, since it is larger than the sum of its proper divisors (180329269).

971604491 is a wasteful number, since it uses less digits than its factorization.

971604491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947 (or 1934 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 971604491 is about 31170.5709123205. The cubic root of 971604491 is about 990.4438002739.

The spelling of 971604491 in words is "nine hundred seventy-one million, six hundred four thousand, four hundred ninety-one".