2131055491 has 2 divisors, whose sum is σ = 2131055492. Its totient is φ = 2131055490.

The previous prime is 2131055467. The next prime is 2131055497. The reversal of 2131055491 is 1945501312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2131055491 - 2²⁵ = 2097501059 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131055497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065527745 + 1065527746.

It is an arithmetic number, because the mean of its divisors is an integer number (1065527746).

Almost surely, 2^2131055491 is an apocalyptic number.

2131055491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131055491 is an equidigital number, since it uses as much as digits as its factorization.

2131055491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 2131055491 is about 46163.3565829003. The cubic root of 2131055491 is about 1286.8608428507.

The spelling of 2131055491 in words is "two billion, one hundred thirty-one million, fifty-five thousand, four hundred ninety-one".