2156986031 has 2 divisors, whose sum is σ = 2156986032. Its totient is φ = 2156986030.

The previous prime is 2156986019. The next prime is 2156986171. The reversal of 2156986031 is 1306896512.

2156986031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156986031 is a prime.

It is a super-2 number, since 2×2156986031² = 9305177475858265922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2156986031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156986631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078493015 + 1078493016.

It is an arithmetic number, because the mean of its divisors is an integer number (1078493016).

Almost surely, 2^2156986031 is an apocalyptic number.

2156986031 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156986031 is an equidigital number, since it uses as much as digits as its factorization.

2156986031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 2156986031 is about 46443.3636917052. The cubic root of 2156986031 is about 1292.0592934716.

The spelling of 2156986031 in words is "two billion, one hundred fifty-six million, nine hundred eighty-six thousand, thirty-one".