31481491 has 8 divisors (see below), whose sum is σ = 32047040. Its totient is φ = 30918888.

The previous prime is 31481479. The next prime is 31481497. The reversal of 31481491 is 19418413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31481491 - 2⁵ = 31481459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31481497) 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, 36220 + ... + 37078.

It is an arithmetic number, because the mean of its divisors is an integer number (4005880).

Almost surely, 2^31481491 is an apocalyptic number.

31481491 is a deficient number, since it is larger than the sum of its proper divisors (565549).

31481491 is an equidigital number, since it uses as much as digits as its factorization.

31481491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473.

The product of its digits is 3456, while the sum is 31.

The square root of 31481491 is about 5610.8369250942. The cubic root of 31481491 is about 315.7561108852.

The spelling of 31481491 in words is "thirty-one million, four hundred eighty-one thousand, four hundred ninety-one".