978191613 has 32 divisors (see below), whose sum is σ = 1674835200. Its totient is φ = 552676608.

The previous prime is 978191581. The next prime is 978191623. The reversal of 978191613 is 316191879.

It is not a de Polignac number, because 978191613 - 2⁵ = 978191581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978191623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12256 + ... + 45897.

It is an arithmetic number, because the mean of its divisors is an integer number (52338600).

Almost surely, 2^978191613 is an apocalyptic number.

It is an amenable number.

978191613 is a deficient number, since it is larger than the sum of its proper divisors (696643587).

978191613 is a wasteful number, since it uses less digits than its factorization.

978191613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58258 (or 58252 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 978191613 is about 31276.0549462364. The cubic root of 978191613 is about 992.6770428650.

The spelling of 978191613 in words is "nine hundred seventy-eight million, one hundred ninety-one thousand, six hundred thirteen".