2161975156 has 24 divisors (see below), whose sum is σ = 4223397024. Its totient is φ = 959861280.

The previous prime is 2161975147. The next prime is 2161975159. The reversal of 2161975156 is 6515791612.

2161975156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2161975156² = 9348273150322448672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161975159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569455 + ... + 573238.

It is an arithmetic number, because the mean of its divisors is an integer number (175974876).

Almost surely, 2^2161975156 is an apocalyptic number.

It is an amenable number.

2161975156 is a deficient number, since it is larger than the sum of its proper divisors (2061421868).

2161975156 is a wasteful number, since it uses less digits than its factorization.

2161975156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142751 (or 1142749 counting only the distinct ones).

The product of its digits is 113400, while the sum is 43.

The square root of 2161975156 is about 46497.0445942535. The cubic root of 2161975156 is about 1293.0547073710.

The spelling of 2161975156 in words is "two billion, one hundred sixty-one million, nine hundred seventy-five thousand, one hundred fifty-six".