97139881 has 8 divisors (see below), whose sum is σ = 100387584. Its totient is φ = 93937200.

The previous prime is 97139869. The next prime is 97139891. The reversal of 97139881 is 18893179.

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 97139881 - 2⁷ = 97139753 is a prime.

It is a super-2 number, since 2×97139881² = 18872312961388322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97139891) 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, 6841 + ... + 15526.

It is an arithmetic number, because the mean of its divisors is an integer number (12548448).

Almost surely, 2^97139881 is an apocalyptic number.

It is an amenable number.

97139881 is a deficient number, since it is larger than the sum of its proper divisors (3247703).

97139881 is a wasteful number, since it uses less digits than its factorization.

97139881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22511.

The product of its digits is 108864, while the sum is 46.

The square root of 97139881 is about 9855.9566253104. The cubic root of 97139881 is about 459.6908461476.

The spelling of 97139881 in words is "ninety-seven million, one hundred thirty-nine thousand, eight hundred eighty-one".