31861148 has 12 divisors (see below), whose sum is σ = 60825912. Its totient is φ = 14482320.

The previous prime is 31861147. The next prime is 31861153. The reversal of 31861148 is 84116813.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31861147) 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 3 ways as a sum of consecutive naturals, for example, 362015 + ... + 362102.

It is an arithmetic number, because the mean of its divisors is an integer number (5068826).

Almost surely, 2^31861148 is an apocalyptic number.

It is an amenable number.

31861148 is a deficient number, since it is larger than the sum of its proper divisors (28964764).

31861148 is a wasteful number, since it uses less digits than its factorization.

31861148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724132 (or 724130 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 31861148 is about 5644.5680082713. The cubic root of 31861148 is about 317.0203491798.

It can be divided in two parts, 3186 and 1148, that added together give a palindrome (4334).

The spelling of 31861148 in words is "thirty-one million, eight hundred sixty-one thousand, one hundred forty-eight".