31648131 has 16 divisors (see below), whose sum is σ = 47683200. Its totient is φ = 20740104.

The previous prime is 31648109. The next prime is 31648147. The reversal of 31648131 is 13184613.

31648131 is a `hidden beast` number, since 3 + 1 + 648 + 13 + 1 = 666.

It is not a de Polignac number, because 31648131 - 2¹³ = 31639939 is a prime.

It is a super-2 number, since 2×31648131² = 2003208391586322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31648095 and 31648104.

It is not an unprimeable number, because it can be changed into a prime (31648151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8341 + ... + 11526.

It is an arithmetic number, because the mean of its divisors is an integer number (2980200).

Almost surely, 2^31648131 is an apocalyptic number.

31648131 is a deficient number, since it is larger than the sum of its proper divisors (16035069).

31648131 is a wasteful number, since it uses less digits than its factorization.

31648131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19935 (or 19929 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 31648131 is about 5625.6671604353. The cubic root of 31648131 is about 316.3122581007.

The spelling of 31648131 in words is "thirty-one million, six hundred forty-eight thousand, one hundred thirty-one".