31481356 has 24 divisors (see below), whose sum is σ = 57294720. Its totient is φ = 15117312.

The previous prime is 31481353. The next prime is 31481369. The reversal of 31481356 is 65318413.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (31481353) 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 7 ways as a sum of consecutive naturals, for example, 25260 + ... + 26476.

It is an arithmetic number, because the mean of its divisors is an integer number (2387280).

Almost surely, 2^31481356 is an apocalyptic number.

It is an amenable number.

31481356 is a deficient number, since it is larger than the sum of its proper divisors (25813364).

31481356 is a wasteful number, since it uses less digits than its factorization.

31481356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473 (or 1471 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 31481356 is about 5610.8248947904. The cubic root of 31481356 is about 315.7556595392.

Adding to 31481356 its reverse (65318413), we get a palindrome (96799769).

The spelling of 31481356 in words is "thirty-one million, four hundred eighty-one thousand, three hundred fifty-six".