2156150781 has 12 divisors (see below), whose sum is σ = 3214906240. Its totient is φ = 1391064840.

The previous prime is 2156150771. The next prime is 2156150807. The reversal of 2156150781 is 1870516512.

2156150781 is a `hidden beast` number, since 2 + 15 + 61 + 507 + 81 = 666.

2156150781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2156150781 - 2²³ = 2147762173 is a prime.

It is a super-2 number, since 2×2156150781² = 9297972380813819922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156150701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3863791 + ... + 3864348.

Almost surely, 2^2156150781 is an apocalyptic number.

It is an amenable number.

2156150781 is a deficient number, since it is larger than the sum of its proper divisors (1058755459).

2156150781 is a wasteful number, since it uses less digits than its factorization.

2156150781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7728176 (or 7728173 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 2156150781 is about 46434.3706859477. The cubic root of 2156150781 is about 1291.8924971738.

The spelling of 2156150781 in words is "two billion, one hundred fifty-six million, one hundred fifty thousand, seven hundred eighty-one".