3126125899681 has 4 divisors (see below), whose sum is σ = 3157077641364. Its totient is φ = 3095174158000.

The previous prime is 3126125899669. The next prime is 3126125899727. The reversal of 3126125899681 is 1869985216213.

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 2800217358225 + 325908541456 = 1673385^2 + 570884^2 .

It is a cyclic number.

It is not a de Polignac number, because 3126125899681 - 2³⁷ = 2988686946209 is a prime.

It is a super-2 number, since 2×3126125899681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3126125899661) 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, 15475870690 + ... + 15475870891.

It is an arithmetic number, because the mean of its divisors is an integer number (789269410341).

Almost surely, 2^{3126125899681} is an apocalyptic number.

It is an amenable number.

3126125899681 is a deficient number, since it is larger than the sum of its proper divisors (30951741683).

3126125899681 is a wasteful number, since it uses less digits than its factorization.

3126125899681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30951741682.

The product of its digits is 11197440, while the sum is 61.

The spelling of 3126125899681 in words is "three trillion, one hundred twenty-six billion, one hundred twenty-five million, eight hundred ninety-nine thousand, six hundred eighty-one".