31431245 has 8 divisors (see below), whose sum is σ = 38234616. Its totient is φ = 24800256.

The previous prime is 31431233. The next prime is 31431251. The reversal of 31431245 is 54213413.

It can be written as a sum of positive squares in 4 ways, for example, as 37636 + 31393609 = 194^2 + 5603^2 .

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 31431245 - 2⁴ = 31431229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31431245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42692 + ... + 43421.

It is an arithmetic number, because the mean of its divisors is an integer number (4779327).

Almost surely, 2^31431245 is an apocalyptic number.

It is an amenable number.

31431245 is a deficient number, since it is larger than the sum of its proper divisors (6803371).

31431245 is an equidigital number, since it uses as much as digits as its factorization.

31431245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86191.

The product of its digits is 1440, while the sum is 23.

The square root of 31431245 is about 5606.3575519226. The cubic root of 31431245 is about 315.5880340330.

Adding to 31431245 its reverse (54213413), we get a palindrome (85644658).

The spelling of 31431245 in words is "thirty-one million, four hundred thirty-one thousand, two hundred forty-five".