97981559 has 4 divisors (see below), whose sum is σ = 105518616. Its totient is φ = 90444504.

The previous prime is 97981553. The next prime is 97981571. The reversal of 97981559 is 95518979.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97981559 is a prime.

It is a super-3 number, since 3×97981559³ (a number of 25 digits) contains 333 as substring.

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 97981559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97981553) 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, 3768509 + ... + 3768534.

It is an arithmetic number, because the mean of its divisors is an integer number (26379654).

Almost surely, 2^97981559 is an apocalyptic number.

97981559 is a deficient number, since it is larger than the sum of its proper divisors (7537057).

97981559 is a wasteful number, since it uses less digits than its factorization.

97981559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7537056.

The product of its digits is 1020600, while the sum is 53.

The square root of 97981559 is about 9898.5634816371. The cubic root of 97981559 is about 461.0147086653.

The spelling of 97981559 in words is "ninety-seven million, nine hundred eighty-one thousand, five hundred fifty-nine".