97565987 has 4 divisors (see below), whose sum is σ = 97880016. Its totient is φ = 97251960.

The previous prime is 97565927. The next prime is 97565989. The reversal of 97565987 is 78956579.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78956579 = 13 ⋅6073583.

It is a cyclic number.

It is not a de Polignac number, because 97565987 - 2⁸ = 97565731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97565989) 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, 156548 + ... + 157169.

It is an arithmetic number, because the mean of its divisors is an integer number (24470004).

Almost surely, 2^97565987 is an apocalyptic number.

97565987 is a deficient number, since it is larger than the sum of its proper divisors (314029).

97565987 is a wasteful number, since it uses less digits than its factorization.

97565987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314028.

The product of its digits is 4762800, while the sum is 56.

The square root of 97565987 is about 9877.5496455346. The cubic root of 97565987 is about 460.3620133876.

The spelling of 97565987 in words is "ninety-seven million, five hundred sixty-five thousand, nine hundred eighty-seven".