2132959981 has 4 divisors (see below), whose sum is σ = 2133349372. Its totient is φ = 2132570592.

The previous prime is 2132959967. The next prime is 2132959999. The reversal of 2132959981 is 1899592312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1040062500 + 1092897481 = 32250^2 + 33059^2 .

It is a cyclic number.

It is not a de Polignac number, because 2132959981 - 2¹³ = 2132951789 is a prime.

It is a super-2 number, since 2×2132959981² = 9099036561095040722, 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 (2132959181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186360 + ... + 197473.

It is an arithmetic number, because the mean of its divisors is an integer number (533337343).

Almost surely, 2^2132959981 is an apocalyptic number.

It is an amenable number.

2132959981 is a deficient number, since it is larger than the sum of its proper divisors (389391).

2132959981 is an equidigital number, since it uses as much as digits as its factorization.

2132959981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389390.

The product of its digits is 349920, while the sum is 49.

The square root of 2132959981 is about 46183.9797007577. The cubic root of 2132959981 is about 1287.2440776523.

The spelling of 2132959981 in words is "two billion, one hundred thirty-two million, nine hundred fifty-nine thousand, nine hundred eighty-one".