31481398 has 16 divisors (see below), whose sum is σ = 50951376. Its totient is φ = 14502240.

The previous prime is 31481393. The next prime is 31481407. The reversal of 31481398 is 89318413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31481393) 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 7 ways as a sum of consecutive naturals, for example, 20340 + ... + 21832.

It is an arithmetic number, because the mean of its divisors is an integer number (3184461).

Almost surely, 2^31481398 is an apocalyptic number.

31481398 is a deficient number, since it is larger than the sum of its proper divisors (19469978).

31481398 is a wasteful number, since it uses less digits than its factorization.

31481398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319.

The product of its digits is 20736, while the sum is 37.

The square root of 31481398 is about 5610.8286375543. The cubic root of 31481398 is about 315.7557999581.

The spelling of 31481398 in words is "thirty-one million, four hundred eighty-one thousand, three hundred ninety-eight".