99997312 has 16 divisors (see below), whose sum is σ = 199213650. Its totient is φ = 49998592.

The previous prime is 99997267. The next prime is 99997357. The reversal of 99997312 is 21379999.

It is an interprime number because it is at equal distance from previous prime (99997267) and next prime (99997357).

It can be written as a sum of positive squares in only one way, i.e., 62346816 + 37650496 = 7896^2 + 6136^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390487 + ... + 390742.

Almost surely, 2^99997312 is an apocalyptic number.

It is an amenable number.

99997312 is a deficient number, since it is larger than the sum of its proper divisors (99216338).

99997312 is an equidigital number, since it uses as much as digits as its factorization.

99997312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781243 (or 781231 counting only the distinct ones).

The product of its digits is 275562, while the sum is 49.

The square root of 99997312 is about 9999.8655990968. The cubic root of 99997312 is about 464.1547244604.

The spelling of 99997312 in words is "ninety-nine million, nine hundred ninety-seven thousand, three hundred twelve".