97615221 has 32 divisors (see below), whose sum is σ = 145248768. Its totient is φ = 57819840.

The previous prime is 97615211. The next prime is 97615223. The reversal of 97615221 is 12251679.

It is not a de Polignac number, because 97615221 - 2⁷ = 97615093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97615223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429910 + ... + 430136.

It is an arithmetic number, because the mean of its divisors is an integer number (4539024).

Almost surely, 2^97615221 is an apocalyptic number.

It is an amenable number.

97615221 is a deficient number, since it is larger than the sum of its proper divisors (47633547).

97615221 is a wasteful number, since it uses less digits than its factorization.

97615221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481.

The product of its digits is 7560, while the sum is 33.

The square root of 97615221 is about 9880.0415484956. The cubic root of 97615221 is about 460.4394367214.

The spelling of 97615221 in words is "ninety-seven million, six hundred fifteen thousand, two hundred twenty-one".