97947431087 has 4 divisors (see below), whose sum is σ = 106851743016. Its totient is φ = 89043119160.

The previous prime is 97947431083. The next prime is 97947431089. The reversal of 97947431087 is 78013474979.

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

It is a cyclic number.

It is not a de Polignac number, because 97947431087 - 2² = 97947431083 is a prime.

It is a super-2 number, since 2×97947431087² (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 (97947431083) 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, 4452155948 + ... + 4452155969.

It is an arithmetic number, because the mean of its divisors is an integer number (26712935754).

Almost surely, 2^97947431087 is an apocalyptic number.

97947431087 is a deficient number, since it is larger than the sum of its proper divisors (8904311929).

97947431087 is a wasteful number, since it uses less digits than its factorization.

97947431087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8904311928.

The product of its (nonzero) digits is 10668672, while the sum is 59.

The spelling of 97947431087 in words is "ninety-seven billion, nine hundred forty-seven million, four hundred thirty-one thousand, eighty-seven".