2991278131 has 2 divisors, whose sum is σ = 2991278132. Its totient is φ = 2991278130.

The previous prime is 2991278119. The next prime is 2991278159. The reversal of 2991278131 is 1318721992.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2991278131 - 2⁵ = 2991278099 is a prime.

It is a super-2 number, since 2×2991278131² = 17895489713997706322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2997278131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495639065 + 1495639066.

It is an arithmetic number, because the mean of its divisors is an integer number (1495639066).

Almost surely, 2^2991278131 is an apocalyptic number.

2991278131 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991278131 is an equidigital number, since it uses as much as digits as its factorization.

2991278131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 2991278131 is about 54692.5783904910. The cubic root of 2991278131 is about 1440.8505345386.

The spelling of 2991278131 in words is "two billion, nine hundred ninety-one million, two hundred seventy-eight thousand, one hundred thirty-one".