97981555 has 16 divisors (see below), whose sum is σ = 136580544. Its totient is φ = 66084480.

The previous prime is 97981553. The next prime is 97981571. The reversal of 97981555 is 55518979.

It is not a de Polignac number, because 97981555 - 2¹ = 97981553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 97981499 and 97981508.

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 15 ways as a sum of consecutive naturals, for example, 20812 + ... + 25081.

It is an arithmetic number, because the mean of its divisors is an integer number (8536284).

Almost surely, 2^97981555 is an apocalyptic number.

97981555 is a deficient number, since it is larger than the sum of its proper divisors (38598989).

97981555 is a wasteful number, since it uses less digits than its factorization.

97981555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45966.

The product of its digits is 567000, while the sum is 49.

The square root of 97981555 is about 9898.5632795876. The cubic root of 97981555 is about 461.0147023918.

The spelling of 97981555 in words is "ninety-seven million, nine hundred eighty-one thousand, five hundred fifty-five".