2136662981 has 4 divisors (see below), whose sum is σ = 2141486592. Its totient is φ = 2131839372.

The previous prime is 2136662951. The next prime is 2136663019. The reversal of 2136662981 is 1892666312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2136662981 - 2¹⁰ = 2136661957 is a prime.

It is a super-2 number, since 2×2136662981² = 9130657388751612722, 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 (2136662951) 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, 2411141 + ... + 2412026.

It is an arithmetic number, because the mean of its divisors is an integer number (535371648).

Almost surely, 2^2136662981 is an apocalyptic number.

It is an amenable number.

2136662981 is a deficient number, since it is larger than the sum of its proper divisors (4823611).

2136662981 is an equidigital number, since it uses as much as digits as its factorization.

2136662981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4823610.

The product of its digits is 186624, while the sum is 44.

The square root of 2136662981 is about 46224.0519751352. The cubic root of 2136662981 is about 1287.9885687311.

The spelling of 2136662981 in words is "two billion, one hundred thirty-six million, six hundred sixty-two thousand, nine hundred eighty-one".