2131156787 has 2 divisors, whose sum is σ = 2131156788. Its totient is φ = 2131156786.

The previous prime is 2131156739. The next prime is 2131156801. The reversal of 2131156787 is 7876511312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2131156787 - 2⁶ = 2131156723 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131156187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065578393 + 1065578394.

It is an arithmetic number, because the mean of its divisors is an integer number (1065578394).

Almost surely, 2^2131156787 is an apocalyptic number.

2131156787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131156787 is an equidigital number, since it uses as much as digits as its factorization.

2131156787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The square root of 2131156787 is about 46164.4537171188. The cubic root of 2131156787 is about 1286.8812320884.

The spelling of 2131156787 in words is "two billion, one hundred thirty-one million, one hundred fifty-six thousand, seven hundred eighty-seven".