97999099981 has 4 divisors (see below), whose sum is σ = 98166049632. Its totient is φ = 97832150332.

The previous prime is 97999099967. The next prime is 97999100009. The reversal of 97999099981 is 18999099979.

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 97999099981 - 2⁷ = 97999099853 is a prime.

It is a super-2 number, since 2×97999099981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97999099921) 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, 83473945 + ... + 83475118.

It is an arithmetic number, because the mean of its divisors is an integer number (24541512408).

Almost surely, 2^97999099981 is an apocalyptic number.

It is an amenable number.

97999099981 is a deficient number, since it is larger than the sum of its proper divisors (166949651).

97999099981 is a wasteful number, since it uses less digits than its factorization.

97999099981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166949650.

The product of its (nonzero) digits is 267846264, while the sum is 79.

The spelling of 97999099981 in words is "ninety-seven billion, nine hundred ninety-nine million, ninety-nine thousand, nine hundred eighty-one".