97521638 has 8 divisors (see below), whose sum is σ = 146382600. Its totient is φ = 48727440.

The previous prime is 97521637. The next prime is 97521647. The reversal of 97521638 is 83612579.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 97521595 and 97521604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97521637) 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, 12863 + ... + 18986.

It is an arithmetic number, because the mean of its divisors is an integer number (18297825).

Almost surely, 2^97521638 is an apocalyptic number.

97521638 is a deficient number, since it is larger than the sum of its proper divisors (48860962).

97521638 is a wasteful number, since it uses less digits than its factorization.

97521638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33382.

The product of its digits is 90720, while the sum is 41.

The square root of 97521638 is about 9875.3044510030. The cubic root of 97521638 is about 460.2922496997.

The spelling of 97521638 in words is "ninety-seven million, five hundred twenty-one thousand, six hundred thirty-eight".