2136256691 has 2 divisors, whose sum is σ = 2136256692. Its totient is φ = 2136256690.

The previous prime is 2136256651. The next prime is 2136256723. The reversal of 2136256691 is 1966526312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2136256691 - 2¹⁴ = 2136240307 is a prime.

It is not a weakly prime, because it can be changed into another prime (2136256631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1068128345 + 1068128346.

It is an arithmetic number, because the mean of its divisors is an integer number (1068128346).

Almost surely, 2^2136256691 is an apocalyptic number.

2136256691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2136256691 is an equidigital number, since it uses as much as digits as its factorization.

2136256691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 2136256691 is about 46219.6569762260. The cubic root of 2136256691 is about 1287.9069258371.

The spelling of 2136256691 in words is "two billion, one hundred thirty-six million, two hundred fifty-six thousand, six hundred ninety-one".