97997905 has 4 divisors (see below), whose sum is σ = 117597492. Its totient is φ = 78398320.

The previous prime is 97997897. The next prime is 97997923. The reversal of 97997905 is 50979979.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64496961 + 33500944 = 8031^2 + 5788^2 .

It is not a de Polignac number, because 97997905 - 2³ = 97997897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9799786 + ... + 9799795.

It is an arithmetic number, because the mean of its divisors is an integer number (29399373).

Almost surely, 2^97997905 is an apocalyptic number.

It is an amenable number.

97997905 is a deficient number, since it is larger than the sum of its proper divisors (19599587).

97997905 is a wasteful number, since it uses less digits than its factorization.

97997905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19599586.

The product of its (nonzero) digits is 1607445, while the sum is 55.

The square root of 97997905 is about 9899.3891225671. The cubic root of 97997905 is about 461.0403438545.

The spelling of 97997905 in words is "ninety-seven million, nine hundred ninety-seven thousand, nine hundred five".