2979197991 has 108 divisors (see below), whose sum is σ = 5682960192. Its totient is φ = 1496880000.

The previous prime is 2979197989. The next prime is 2979198011. The reversal of 2979197991 is 1997919792.

2979197991 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2979197991 - 2¹ = 2979197989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2979197491) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1653291 + ... + 1655091.

Almost surely, 2^2979197991 is an apocalyptic number.

2979197991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2979197991 is a deficient number, since it is larger than the sum of its proper divisors (2703762201).

2979197991 is a wasteful number, since it uses less digits than its factorization.

2979197991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874 (or 1853 counting only the distinct ones).

The product of its digits is 5786802, while the sum is 63.

The square root of 2979197991 is about 54582.0299274404. The cubic root of 2979197991 is about 1438.9083146581.

The spelling of 2979197991 in words is "two billion, nine hundred seventy-nine million, one hundred ninety-seven thousand, nine hundred ninety-one".