97644491 has 4 divisors (see below), whose sum is σ = 111593712. Its totient is φ = 83695272.

The previous prime is 97644473. The next prime is 97644509. The reversal of 97644491 is 19444679.

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

It is an interprime number because it is at equal distance from previous prime (97644473) and next prime (97644509).

It is a cyclic number.

It is not a de Polignac number, because 97644491 - 2¹⁴ = 97628107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97644461) 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, 6974600 + ... + 6974613.

It is an arithmetic number, because the mean of its divisors is an integer number (27898428).

Almost surely, 2^97644491 is an apocalyptic number.

97644491 is a deficient number, since it is larger than the sum of its proper divisors (13949221).

97644491 is a wasteful number, since it uses less digits than its factorization.

97644491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13949220.

The product of its digits is 217728, while the sum is 44.

The square root of 97644491 is about 9881.5227065468. The cubic root of 97644491 is about 460.4854531635.

The spelling of 97644491 in words is "ninety-seven million, six hundred forty-four thousand, four hundred ninety-one".