31883172047 has 4 divisors (see below), whose sum is σ = 31914771840. Its totient is φ = 31851572256.

The previous prime is 31883172037. The next prime is 31883172059. The reversal of 31883172047 is 74027138813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74027138813 = 191 ⋅387576643.

It is a cyclic number.

It is not a de Polignac number, because 31883172047 - 2²⁴ = 31866394831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31883171989 and 31883172007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31883172037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15798383 + ... + 15800400.

It is an arithmetic number, because the mean of its divisors is an integer number (7978692960).

Almost surely, 2^31883172047 is an apocalyptic number.

31883172047 is a deficient number, since it is larger than the sum of its proper divisors (31599793).

31883172047 is a wasteful number, since it uses less digits than its factorization.

31883172047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31599792.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 31883172047 in words is "thirty-one billion, eight hundred eighty-three million, one hundred seventy-two thousand, forty-seven".