2149156881 has 63 divisors (see below), whose sum is σ = 3457181953. Its totient is φ = 1335139200.

The previous prime is 2149156873. The next prime is 2149156897. The reversal of 2149156881 is 1886519412.

It is a happy number.

The square root of 2149156881 is 46359.

It is a perfect power (a square), and thus also a powerful number.

2149156881 is a `hidden beast` number, since 2 + 1 + 4 + 9 + 1 + 568 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1279850625 + 869306256 = 35775^2 + 29484^2 .

It is not a de Polignac number, because 2149156881 - 2³ = 2149156873 is a prime.

It is a super-2 number, since 2×2149156881² = 9237750598299296322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2149156381) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 21278731 + ... + 21278831.

Almost surely, 2^2149156881 is an apocalyptic number.

2149156881 is the 46359-th square number.

2149156881 is the 23180-th centered octagonal number.

It is an amenable number.

2149156881 is a deficient number, since it is larger than the sum of its proper divisors (1308025072).

2149156881 is an frugal number, since it uses more digits than its factorization.

2149156881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 121 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The cubic root of 2149156881 is about 1290.4941481669.

The spelling of 2149156881 in words is "two billion, one hundred forty-nine million, one hundred fifty-six thousand, eight hundred eighty-one".