97162821 has 36 divisors (see below), whose sum is σ = 167035232. Its totient is φ = 55289304.

The previous prime is 97162801. The next prime is 97162841. The reversal of 97162821 is 12826179.

97162821 is a `hidden beast` number, since 9 + 7 + 1 + 628 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (97162801) and next prime (97162841).

It is not a de Polignac number, because 97162821 - 2⁷ = 97162693 is a prime.

It is a super-2 number, since 2×97162821² = 18881227569356082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97162801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 406420 + ... + 406658.

Almost surely, 2^97162821 is an apocalyptic number.

It is an amenable number.

97162821 is a deficient number, since it is larger than the sum of its proper divisors (69872411).

97162821 is an frugal number, since it uses more digits than its factorization.

97162821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 249 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 97162821 is about 9857.1203198500. The cubic root of 97162821 is about 459.7270292886.

Multiplying 97162821 by its product of digits (12096), we get a square (1175281482816 = 1084104²).

The spelling of 97162821 in words is "ninety-seven million, one hundred sixty-two thousand, eight hundred twenty-one".