31798945 has 4 divisors (see below), whose sum is σ = 38158740. Its totient is φ = 25439152.

The previous prime is 31798927. The next prime is 31798967. The reversal of 31798945 is 54989713.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8363664 + 23435281 = 2892^2 + 4841^2 .

It is a cyclic number.

It is not a de Polignac number, because 31798945 - 2⁹ = 31798433 is a prime.

It is a super-2 number, since 2×31798945² = 2022345806226050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31798895 and 31798904.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3179890 + ... + 3179899.

It is an arithmetic number, because the mean of its divisors is an integer number (9539685).

Almost surely, 2^31798945 is an apocalyptic number.

It is an amenable number.

31798945 is a deficient number, since it is larger than the sum of its proper divisors (6359795).

31798945 is an equidigital number, since it uses as much as digits as its factorization.

31798945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6359794.

The product of its digits is 272160, while the sum is 46.

The square root of 31798945 is about 5639.0553286876. The cubic root of 31798945 is about 316.8139069043.

The spelling of 31798945 in words is "thirty-one million, seven hundred ninety-eight thousand, nine hundred forty-five".