2131977609 has 6 divisors (see below), whose sum is σ = 3079523226. Its totient is φ = 1421318400.

The previous prime is 2131977583. The next prime is 2131977619. The reversal of 2131977609 is 9067791312.

2131977609 is a `hidden beast` number, since 2 + 1 + 31 + 9 + 7 + 7 + 609 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2058618384 + 73359225 = 45372^2 + 8565^2 .

It is not a de Polignac number, because 2131977609 - 2¹² = 2131973513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2131977619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118443192 + ... + 118443209.

It is an arithmetic number, because the mean of its divisors is an integer number (513253871).

Almost surely, 2^2131977609 is an apocalyptic number.

It is an amenable number.

2131977609 is a deficient number, since it is larger than the sum of its proper divisors (947545617).

2131977609 is a wasteful number, since it uses less digits than its factorization.

2131977609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236886407 (or 236886404 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 2131977609 is about 46173.3430563567. The cubic root of 2131977609 is about 1287.0464263856.

The spelling of 2131977609 in words is "two billion, one hundred thirty-one million, nine hundred seventy-seven thousand, six hundred nine".