31383131 has 6 divisors (see below), whose sum is σ = 33983100. Its totient is φ = 28968888.

The previous prime is 31383083. The next prime is 31383161. The reversal of 31383131 is 13138313.

It is a happy number.

It is not a de Polignac number, because 31383131 - 2¹⁰ = 31382107 is a prime.

It is a super-2 number, since 2×31383131² = 1969801822726322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31383097 and 31383106.

It is not an unprimeable number, because it can be changed into a prime (31383161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92681 + ... + 93018.

It is an arithmetic number, because the mean of its divisors is an integer number (5663850).

Almost surely, 2^31383131 is an apocalyptic number.

31383131 is a deficient number, since it is larger than the sum of its proper divisors (2599969).

31383131 is a wasteful number, since it uses less digits than its factorization.

31383131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185725 (or 185712 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 31383131 is about 5602.0648871644. The cubic root of 31383131 is about 315.4269209208.

The spelling of 31383131 in words is "thirty-one million, three hundred eighty-three thousand, one hundred thirty-one".