97436821 has 4 divisors (see below), whose sum is σ = 98401644. Its totient is φ = 96472000.

The previous prime is 97436819. The next prime is 97436831. The reversal of 97436821 is 12863479.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39828721 + 57608100 = 6311^2 + 7590^2 .

It is a cyclic number.

It is not a de Polignac number, because 97436821 - 2¹ = 97436819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97436831) 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, 482260 + ... + 482461.

It is an arithmetic number, because the mean of its divisors is an integer number (24600411).

Almost surely, 2^97436821 is an apocalyptic number.

It is an amenable number.

97436821 is a deficient number, since it is larger than the sum of its proper divisors (964823).

97436821 is a wasteful number, since it uses less digits than its factorization.

97436821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964822.

The product of its digits is 72576, while the sum is 40.

The square root of 97436821 is about 9871.0091176131. The cubic root of 97436821 is about 460.1587684464.

The spelling of 97436821 in words is "ninety-seven million, four hundred thirty-six thousand, eight hundred twenty-one".