2991254121 has 24 divisors (see below), whose sum is σ = 4593640896. Its totient is φ = 1871469600.

The previous prime is 2991254099. The next prime is 2991254141. The reversal of 2991254121 is 1214521992.

2991254121 is a `hidden beast` number, since 2 + 9 + 91 + 2 + 541 + 21 = 666.

2991254121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2991254121 - 2²³ = 2982865513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2991254141) 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, 125355 + ... + 147296.

It is an arithmetic number, because the mean of its divisors is an integer number (191401704).

Almost surely, 2^2991254121 is an apocalyptic number.

It is an amenable number.

2991254121 is a deficient number, since it is larger than the sum of its proper divisors (1602386775).

2991254121 is a wasteful number, since it uses less digits than its factorization.

2991254121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272733 (or 272730 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 2991254121 is about 54692.3588904337. The cubic root of 2991254121 is about 1440.8466794514.

The spelling of 2991254121 in words is "two billion, nine hundred ninety-one million, two hundred fifty-four thousand, one hundred twenty-one".