3172387681 has 4 divisors (see below), whose sum is σ = 3202036272. Its totient is φ = 3142739092.

The previous prime is 3172387639. The next prime is 3172387693. The reversal of 3172387681 is 1867832713.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1867832713 = 71 ⋅26307503.

It is a cyclic number.

It is not a de Polignac number, because 3172387681 - 2⁷ = 3172387553 is a prime.

It is a super-2 number, since 2×3172387681² = 20128087197121115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3172387601) 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 3 ways as a sum of consecutive naturals, for example, 14824135 + ... + 14824348.

It is an arithmetic number, because the mean of its divisors is an integer number (800509068).

Almost surely, 2^3172387681 is an apocalyptic number.

It is an amenable number.

3172387681 is a deficient number, since it is larger than the sum of its proper divisors (29648591).

3172387681 is a wasteful number, since it uses less digits than its factorization.

3172387681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29648590.

The product of its digits is 338688, while the sum is 46.

The square root of 3172387681 is about 56323.9529951512. The cubic root of 3172387681 is about 1469.3618222647.

The spelling of 3172387681 in words is "three billion, one hundred seventy-two million, three hundred eighty-seven thousand, six hundred eighty-one".