97561491 has 8 divisors (see below), whose sum is σ = 130160640. Its totient is φ = 65001672.

The previous prime is 97561439. The next prime is 97561493. The reversal of 97561491 is 19416579.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 97561491 - 2⁷ = 97561363 is a prime.

It is a super-2 number, since 2×97561491² = 19036489052286162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (97561493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3451 + ... + 14388.

It is an arithmetic number, because the mean of its divisors is an integer number (16270080).

Almost surely, 2^97561491 is an apocalyptic number.

97561491 is a deficient number, since it is larger than the sum of its proper divisors (32599149).

97561491 is a wasteful number, since it uses less digits than its factorization.

97561491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19665.

The product of its digits is 68040, while the sum is 42.

The square root of 97561491 is about 9877.3220561041. The cubic root of 97561491 is about 460.3549418679.

The spelling of 97561491 in words is "ninety-seven million, five hundred sixty-one thousand, four hundred ninety-one".