31481000 has 32 divisors (see below), whose sum is σ = 73667880. Its totient is φ = 12592000.

The previous prime is 31480973. The next prime is 31481011. The reversal of 31481000 is 18413.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2815684 + 28665316 = 1678^2 + 5354^2 .

It is a super-2 number, since 2×31481000² = 1982106722000000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31481000.

It is an unprimeable number.

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, 14741 + ... + 16740.

Almost surely, 2^31481000 is an apocalyptic number.

It is an amenable number.

31481000 is an abundant number, since it is smaller than the sum of its proper divisors (42186880).

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

31481000 is a wasteful number, since it uses less digits than its factorization.

31481000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31502 (or 31488 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 31481000 is about 5610.7931703102. The cubic root of 31481000 is about 315.7544693169.

Adding to 31481000 its reverse (18413), we get a palindrome (31499413).

The spelling of 31481000 in words is "thirty-one million, four hundred eighty-one thousand".