97902491 has 4 divisors (see below), whose sum is σ = 97924152. Its totient is φ = 97880832.

The previous prime is 97902461. The next prime is 97902509. The reversal of 97902491 is 19420979.

It is a happy number.

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 97902491 - 2¹⁰ = 97901467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97902451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1190 + ... + 14043.

It is an arithmetic number, because the mean of its divisors is an integer number (24481038).

Almost surely, 2^97902491 is an apocalyptic number.

97902491 is a deficient number, since it is larger than the sum of its proper divisors (21661).

97902491 is a wasteful number, since it uses less digits than its factorization.

97902491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21660.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 97902491 is about 9894.5687627102. The cubic root of 97902491 is about 460.8906672272.

The spelling of 97902491 in words is "ninety-seven million, nine hundred two thousand, four hundred ninety-one".