3131281923 has 48 divisors (see below), whose sum is σ = 5343867648. Its totient is φ = 1595880000.

The previous prime is 3131281877. The next prime is 3131281943. The reversal of 3131281923 is 3291821313.

It is not a de Polignac number, because 3131281923 - 2⁶ = 3131281859 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (3131281943) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123048 + ... + 146298.

It is an arithmetic number, because the mean of its divisors is an integer number (111330576).

Almost surely, 2^3131281923 is an apocalyptic number.

3131281923 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

3131281923 is a deficient number, since it is larger than the sum of its proper divisors (2212585725).

3131281923 is a wasteful number, since it uses less digits than its factorization.

3131281923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23336 (or 23325 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 3131281923 is about 55957.8584561632. The cubic root of 3131281923 is about 1462.9878642972.

The spelling of 3131281923 in words is "three billion, one hundred thirty-one million, two hundred eighty-one thousand, nine hundred twenty-three".