97475821 has 4 divisors (see below), whose sum is σ = 98930752. Its totient is φ = 96020892.

The previous prime is 97475813. The next prime is 97475831. The reversal of 97475821 is 12857479.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12857479 = 113 ⋅113783.

It is a cyclic number.

It is not a de Polignac number, because 97475821 - 2³ = 97475813 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 (97475831) 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, 727365 + ... + 727498.

It is an arithmetic number, because the mean of its divisors is an integer number (24732688).

Almost surely, 2^97475821 is an apocalyptic number.

It is an amenable number.

97475821 is a deficient number, since it is larger than the sum of its proper divisors (1454931).

97475821 is a wasteful number, since it uses less digits than its factorization.

97475821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454930.

The product of its digits is 141120, while the sum is 43.

The square root of 97475821 is about 9872.9844018919. The cubic root of 97475821 is about 460.2201545423.

The spelling of 97475821 in words is "ninety-seven million, four hundred seventy-five thousand, eight hundred twenty-one".