2131783681 has 8 divisors (see below), whose sum is σ = 2225493504. Its totient is φ = 2038159200.

The previous prime is 2131783673. The next prime is 2131783699. The reversal of 2131783681 is 1863871312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2131783681 - 2³ = 2131783673 is a prime.

It is a super-2 number, since 2×2131783681² = 9089003325155819522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131783631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32656 + ... + 73006.

It is an arithmetic number, because the mean of its divisors is an integer number (278186688).

Almost surely, 2^2131783681 is an apocalyptic number.

It is an amenable number.

2131783681 is a deficient number, since it is larger than the sum of its proper divisors (93709823).

2131783681 is a wasteful number, since it uses less digits than its factorization.

2131783681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42671.

The product of its digits is 48384, while the sum is 40.

The square root of 2131783681 is about 46171.2430090419. The cubic root of 2131783681 is about 1287.0074012873.

The spelling of 2131783681 in words is "two billion, one hundred thirty-one million, seven hundred eighty-three thousand, six hundred eighty-one".