31872861871733 has 4 divisors (see below), whose sum is σ = 33747736099500. Its totient is φ = 29997987643968.

The previous prime is 31872861871727. The next prime is 31872861871757. The reversal of 31872861871733 is 33717816827813.

It is a happy number.

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 21398330943889 + 10474530927844 = 4625833^2 + 3236438^2 .

It is a cyclic number.

It is not a de Polignac number, because 31872861871733 - 2³⁴ = 31855682002549 is a prime.

It is a super-2 number, since 2×31872861871733² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31872861871733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31872861871133) 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, 937437113858 + ... + 937437113891.

It is an arithmetic number, because the mean of its divisors is an integer number (8436934024875).

Almost surely, 2^{31872861871733} is an apocalyptic number.

It is an amenable number.

31872861871733 is a deficient number, since it is larger than the sum of its proper divisors (1874874227767).

31872861871733 is a wasteful number, since it uses less digits than its factorization.

31872861871733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874874227766.

The product of its digits is 56899584, while the sum is 65.

The spelling of 31872861871733 in words is "thirty-one trillion, eight hundred seventy-two billion, eight hundred sixty-one million, eight hundred seventy-one thousand, seven hundred thirty-three".