97991413 has 8 divisors (see below), whose sum is σ = 105645848. Its totient is φ = 90353664.

The previous prime is 97991407. The next prime is 97991423. The reversal of 97991413 is 31419979.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15944049 + 82047364 = 3993^2 + 9058^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97991413 - 2⁹ = 97990901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97991413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97991423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9781 + ... + 17077.

It is an arithmetic number, because the mean of its divisors is an integer number (13205731).

Almost surely, 2^97991413 is an apocalyptic number.

It is an amenable number.

97991413 is a deficient number, since it is larger than the sum of its proper divisors (7654435).

97991413 is a wasteful number, since it uses less digits than its factorization.

97991413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8343.

The product of its digits is 61236, while the sum is 43.

The square root of 97991413 is about 9899.0612181156. The cubic root of 97991413 is about 461.0301628886.

The spelling of 97991413 in words is "ninety-seven million, nine hundred ninety-one thousand, four hundred thirteen".