97918621 has 4 divisors (see below), whose sum is σ = 97939744. Its totient is φ = 97897500.

The previous prime is 97918577. The next prime is 97918627. The reversal of 97918621 is 12681979.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 97918621 - 2¹⁷ = 97787549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97918627) 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, 255 + ... + 13996.

It is an arithmetic number, because the mean of its divisors is an integer number (24484936).

Almost surely, 2^97918621 is an apocalyptic number.

It is an amenable number.

97918621 is a deficient number, since it is larger than the sum of its proper divisors (21123).

97918621 is a wasteful number, since it uses less digits than its factorization.

97918621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21122.

The product of its digits is 54432, while the sum is 43.

The square root of 97918621 is about 9895.3838227731. The cubic root of 97918621 is about 460.9159773024.

It can be divided in two parts, 979 and 18621, that added together give a square (19600 = 140²).

The spelling of 97918621 in words is "ninety-seven million, nine hundred eighteen thousand, six hundred twenty-one".