97777987 has 2 divisors, whose sum is σ = 97777988. Its totient is φ = 97777986.

The previous prime is 97777961. The next prime is 97777997. The reversal of 97777987 is 78977779.

It is a strong prime.

It is an emirp because it is prime and its reverse (78977779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97777987 - 2²³ = 89389379 is a prime.

It is not a weakly prime, because it can be changed into another prime (97777957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48888993 + 48888994.

It is an arithmetic number, because the mean of its divisors is an integer number (48888994).

Almost surely, 2^97777987 is an apocalyptic number.

97777987 is a deficient number, since it is larger than the sum of its proper divisors (1).

97777987 is an equidigital number, since it uses as much as digits as its factorization.

97777987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10890936, while the sum is 61.

The square root of 97777987 is about 9888.2752287747. The cubic root of 97777987 is about 460.6952105946.

The spelling of 97777987 in words is "ninety-seven million, seven hundred seventy-seven thousand, nine hundred eighty-seven".