97215919 has 4 divisors (see below), whose sum is σ = 97244280. Its totient is φ = 97187560.

The previous prime is 97215889. The next prime is 97215941. The reversal of 97215919 is 91951279.

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

It is a cyclic number.

It is not a de Polignac number, because 97215919 - 2⁵ = 97215887 is a prime.

It is a super-2 number, since 2×97215919² = 18901869814029122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97215119) 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 3 ways as a sum of consecutive naturals, for example, 8197 + ... + 16174.

It is an arithmetic number, because the mean of its divisors is an integer number (24311070).

Almost surely, 2^97215919 is an apocalyptic number.

97215919 is a deficient number, since it is larger than the sum of its proper divisors (28361).

97215919 is a wasteful number, since it uses less digits than its factorization.

97215919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28360.

The product of its digits is 51030, while the sum is 43.

The square root of 97215919 is about 9859.8133349471. The cubic root of 97215919 is about 459.8107586418.

The spelling of 97215919 in words is "ninety-seven million, two hundred fifteen thousand, nine hundred nineteen".