2974491981 has 24 divisors (see below), whose sum is σ = 4457587680. Its totient is φ = 1909039776.

The previous prime is 2974491977. The next prime is 2974491991. The reversal of 2974491981 is 1891944792.

2974491981 is a `hidden beast` number, since 2 + 9 + 7 + 449 + 198 + 1 = 666.

It is not a de Polignac number, because 2974491981 - 2² = 2974491977 is a prime.

It is a super-2 number, since 2×2974491981² = 17695205090066608722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2974491941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74146 + ... + 106988.

It is an arithmetic number, because the mean of its divisors is an integer number (185732820).

Almost surely, 2^2974491981 is an apocalyptic number.

It is an amenable number.

2974491981 is a deficient number, since it is larger than the sum of its proper divisors (1483095699).

2974491981 is a wasteful number, since it uses less digits than its factorization.

2974491981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33225 (or 33222 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 2974491981 is about 54538.9033718134. The cubic root of 2974491981 is about 1438.1502711005.

The spelling of 2974491981 in words is "two billion, nine hundred seventy-four million, four hundred ninety-one thousand, nine hundred eighty-one".