31945105 has 4 divisors (see below), whose sum is σ = 38334132. Its totient is φ = 25556080.

The previous prime is 31945073. The next prime is 31945139. The reversal of 31945105 is 50154913.

It is a Cunningham number, because it is equal to 5652²+1.

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 11505664 + 20439441 = 3392^2 + 4521^2 .

It is not a de Polignac number, because 31945105 - 2⁵ = 31945073 is a prime.

It is a super-2 number, since 2×31945105² = 2040979466922050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3194506 + ... + 3194515.

It is an arithmetic number, because the mean of its divisors is an integer number (9583533).

Almost surely, 2^31945105 is an apocalyptic number.

It is an amenable number.

31945105 is a deficient number, since it is larger than the sum of its proper divisors (6389027).

31945105 is an equidigital number, since it uses as much as digits as its factorization.

31945105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6389026.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 31945105 is about 5652.0000884643. Note that the first 4 decimals coincide. The cubic root of 31945105 is about 317.2985640246.

The spelling of 31945105 in words is "thirty-one million, nine hundred forty-five thousand, one hundred five".