979748997491 has 4 divisors (see below), whose sum is σ = 1068817088184. Its totient is φ = 890680906800.

The previous prime is 979748997463. The next prime is 979748997527. The reversal of 979748997491 is 194799847979.

It is a happy number.

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 979748997491 - 2⁶ = 979748997427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (979748997691) 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, 44534045330 + ... + 44534045351.

It is an arithmetic number, because the mean of its divisors is an integer number (267204272046).

Almost surely, 2^979748997491 is an apocalyptic number.

979748997491 is a deficient number, since it is larger than the sum of its proper divisors (89068090693).

979748997491 is a wasteful number, since it uses less digits than its factorization.

979748997491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89068090692.

The product of its digits is 2592487296, while the sum is 83.

The spelling of 979748997491 in words is "nine hundred seventy-nine billion, seven hundred forty-eight million, nine hundred ninety-seven thousand, four hundred ninety-one".