2156909831927 has 2 divisors, whose sum is σ = 2156909831928. Its totient is φ = 2156909831926.

The previous prime is 2156909831891. The next prime is 2156909832029. The reversal of 2156909831927 is 7291389096512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2156909831927 - 2¹⁰ = 2156909830903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2156909831927.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156909830927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078454915963 + 1078454915964.

It is an arithmetic number, because the mean of its divisors is an integer number (1078454915964).

Almost surely, 2^{2156909831927} is an apocalyptic number.

2156909831927 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156909831927 is an equidigital number, since it uses as much as digits as its factorization.

2156909831927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14696640, while the sum is 62.

The spelling of 2156909831927 in words is "two trillion, one hundred fifty-six billion, nine hundred nine million, eight hundred thirty-one thousand, nine hundred twenty-seven".