2137881965 has 4 divisors (see below), whose sum is σ = 2565458364. Its totient is φ = 1710305568.

The previous prime is 2137881961. The next prime is 2137881979. The reversal of 2137881965 is 5691887312.

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 793999684 + 1343882281 = 28178^2 + 36659^2 .

It is a cyclic number.

It is not a de Polignac number, because 2137881965 - 2² = 2137881961 is a prime.

It is a super-2 number, since 2×2137881965² = 9141078592544522450, 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 (2137881961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213788192 + ... + 213788201.

It is an arithmetic number, because the mean of its divisors is an integer number (641364591).

Almost surely, 2^2137881965 is an apocalyptic number.

It is an amenable number.

2137881965 is a deficient number, since it is larger than the sum of its proper divisors (427576399).

2137881965 is an equidigital number, since it uses as much as digits as its factorization.

2137881965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427576398.

The product of its digits is 725760, while the sum is 50.

The square root of 2137881965 is about 46237.2356980821. The cubic root of 2137881965 is about 1288.2334582298.

The spelling of 2137881965 in words is "two billion, one hundred thirty-seven million, eight hundred eighty-one thousand, nine hundred sixty-five".