97981587 has 48 divisors (see below), whose sum is σ = 165604608. Its totient is φ = 55218240.

The previous prime is 97981573. The next prime is 97981589. The reversal of 97981587 is 78518979.

It is not a de Polignac number, because 97981587 - 2⁴ = 97981571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97981589) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83668 + ... + 84830.

It is an arithmetic number, because the mean of its divisors is an integer number (3450096).

Almost surely, 2^97981587 is an apocalyptic number.

97981587 is a deficient number, since it is larger than the sum of its proper divisors (67623021).

97981587 is a wasteful number, since it uses less digits than its factorization.

97981587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240 (or 1237 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 54.

The square root of 97981587 is about 9898.5648959837. The cubic root of 97981587 is about 461.0147525797.

The spelling of 97981587 in words is "ninety-seven million, nine hundred eighty-one thousand, five hundred eighty-seven".