2149156381 has 2 divisors, whose sum is σ = 2149156382. Its totient is φ = 2149156380.

The previous prime is 2149156333. The next prime is 2149156393. The reversal of 2149156381 is 1836519412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1906108281 + 243048100 = 43659^2 + 15590^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149156381 - 2¹¹ = 2149154333 is a prime.

It is a super-2 number, since 2×2149156381² = 9237746299986034322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2149126381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074578190 + 1074578191.

It is an arithmetic number, because the mean of its divisors is an integer number (1074578191).

Almost surely, 2^2149156381 is an apocalyptic number.

It is an amenable number.

2149156381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2149156381 is an equidigital number, since it uses as much as digits as its factorization.

2149156381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 40.

The square root of 2149156381 is about 46358.9946073036. The cubic root of 2149156381 is about 1290.4940480893.

The spelling of 2149156381 in words is "two billion, one hundred forty-nine million, one hundred fifty-six thousand, three hundred eighty-one".