31130649 has 20 divisors (see below), whose sum is σ = 50732880. Its totient is φ = 18866520.

The previous prime is 31130641. The next prime is 31130651. The reversal of 31130649 is 94603113.

31130649 is a `hidden beast` number, since 3 + 1 + 13 + 0 + 649 = 666.

It is not a de Polignac number, because 31130649 - 2³ = 31130641 is a prime.

It is a super-2 number, since 2×31130649² = 1938234614322402, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (31130641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16579 + ... + 18360.

It is an arithmetic number, because the mean of its divisors is an integer number (2536644).

Almost surely, 2^31130649 is an apocalyptic number.

It is an amenable number.

31130649 is a deficient number, since it is larger than the sum of its proper divisors (19602231).

31130649 is a wasteful number, since it uses less digits than its factorization.

31130649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34962 (or 34953 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 31130649 is about 5579.4846536217. The cubic root of 31130649 is about 314.5787566585.

The spelling of 31130649 in words is "thirty-one million, one hundred thirty thousand, six hundred forty-nine".