97772515 has 4 divisors (see below), whose sum is σ = 117327024. Its totient is φ = 78218008.

The previous prime is 97772513. The next prime is 97772527. The reversal of 97772515 is 51527779.

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 97772515 - 2¹ = 97772513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97772513) 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, 9777247 + ... + 9777256.

It is an arithmetic number, because the mean of its divisors is an integer number (29331756).

Almost surely, 2^97772515 is an apocalyptic number.

97772515 is a deficient number, since it is larger than the sum of its proper divisors (19554509).

97772515 is a wasteful number, since it uses less digits than its factorization.

97772515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19554508.

The product of its digits is 154350, while the sum is 43.

The square root of 97772515 is about 9887.9985335759. The cubic root of 97772515 is about 460.6866163929.

The spelling of 97772515 in words is "ninety-seven million, seven hundred seventy-two thousand, five hundred fifteen".