97917961 has 4 divisors (see below), whose sum is σ = 97955092. Its totient is φ = 97880832.

The previous prime is 97917959. The next prime is 97917973. The reversal of 97917961 is 16971979.

It is a happy number.

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 78943225 + 18974736 = 8885^2 + 4356^2 .

It is a 3-Lehmer number, since φ(97917961) divides (97917961-1)³.

It is a cyclic number.

It is not a de Polignac number, because 97917961 - 2¹ = 97917959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97917901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14280 + ... + 19993.

It is an arithmetic number, because the mean of its divisors is an integer number (24488773).

Almost surely, 2^97917961 is an apocalyptic number.

It is an amenable number.

97917961 is a deficient number, since it is larger than the sum of its proper divisors (37131).

97917961 is a wasteful number, since it uses less digits than its factorization.

97917961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37130.

The product of its digits is 214326, while the sum is 49.

The square root of 97917961 is about 9895.3504738337. The cubic root of 97917961 is about 460.9149417308.

The spelling of 97917961 in words is "ninety-seven million, nine hundred seventeen thousand, nine hundred sixty-one".