97528421 has 4 divisors (see below), whose sum is σ = 100891500. Its totient is φ = 94165344.

The previous prime is 97528391. The next prime is 97528433. The reversal of 97528421 is 12482579.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12482579 = 37 ⋅337367.

It can be written as a sum of positive squares in 2 ways, for example, as 59459521 + 38068900 = 7711^2 + 6170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97528421 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 (97528451) 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, 1681496 + ... + 1681553.

It is an arithmetic number, because the mean of its divisors is an integer number (25222875).

Almost surely, 2^97528421 is an apocalyptic number.

It is an amenable number.

97528421 is a deficient number, since it is larger than the sum of its proper divisors (3363079).

97528421 is a wasteful number, since it uses less digits than its factorization.

97528421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363078.

The product of its digits is 40320, while the sum is 38.

The square root of 97528421 is about 9875.6478774813. The cubic root of 97528421 is about 460.3029211432.

The spelling of 97528421 in words is "ninety-seven million, five hundred twenty-eight thousand, four hundred twenty-one".