97708987 has 2 divisors, whose sum is σ = 97708988. Its totient is φ = 97708986.

The previous prime is 97708957. The next prime is 97708997. The reversal of 97708987 is 78980779.

It is a strong prime.

It is an emirp because it is prime and its reverse (78980779) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97708987 is a prime.

It is a super-2 number, since 2×97708987² = 19094092281132338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97708927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48854493 + 48854494.

It is an arithmetic number, because the mean of its divisors is an integer number (48854494).

Almost surely, 2^97708987 is an apocalyptic number.

97708987 is a deficient number, since it is larger than the sum of its proper divisors (1).

97708987 is an equidigital number, since it uses as much as digits as its factorization.

97708987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 97708987 is about 9884.7856324758. The cubic root of 97708987 is about 460.5868172475.

The spelling of 97708987 in words is "ninety-seven million, seven hundred eight thousand, nine hundred eighty-seven".