97997491 has 4 divisors (see below), whose sum is σ = 100082592. Its totient is φ = 95912392.

The previous prime is 97997461. The next prime is 97997509. The reversal of 97997491 is 19479979.

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

It is a cyclic number.

It is not a de Polignac number, because 97997491 - 2¹³ = 97989299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97997461) 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, 1042480 + ... + 1042573.

It is an arithmetic number, because the mean of its divisors is an integer number (25020648).

Almost surely, 2^97997491 is an apocalyptic number.

97997491 is a deficient number, since it is larger than the sum of its proper divisors (2085101).

97997491 is a wasteful number, since it uses less digits than its factorization.

97997491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085100.

The product of its digits is 1285956, while the sum is 55.

The square root of 97997491 is about 9899.3682121638. The cubic root of 97997491 is about 461.0396946197.

The spelling of 97997491 in words is "ninety-seven million, nine hundred ninety-seven thousand, four hundred ninety-one".