31861356 has 12 divisors (see below), whose sum is σ = 74343192. Its totient is φ = 10620448.

The previous prime is 31861351. The next prime is 31861369. The reversal of 31861356 is 65316813.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (31861351) 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, 1327545 + ... + 1327568.

It is an arithmetic number, because the mean of its divisors is an integer number (6195266).

Almost surely, 2^31861356 is an apocalyptic number.

It is an amenable number.

31861356 is an abundant number, since it is smaller than the sum of its proper divisors (42481836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31861356 is a wasteful number, since it uses less digits than its factorization.

31861356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655120 (or 2655118 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 31861356 is about 5644.5864330348. The cubic root of 31861356 is about 317.0210390492.

The spelling of 31861356 in words is "thirty-one million, eight hundred sixty-one thousand, three hundred fifty-six".