31745993 has 4 divisors (see below), whose sum is σ = 32345028. Its totient is φ = 31146960.

The previous prime is 31745983. The next prime is 31746023. The reversal of 31745993 is 39954713.

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 23697424 + 8048569 = 4868^2 + 2837^2 .

It is a cyclic number.

It is not a de Polignac number, because 31745993 - 2⁴ = 31745977 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 31745993.

It is not an unprimeable number, because it can be changed into a prime (31745933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299438 + ... + 299543.

It is an arithmetic number, because the mean of its divisors is an integer number (8086257).

Almost surely, 2^31745993 is an apocalyptic number.

It is an amenable number.

31745993 is a deficient number, since it is larger than the sum of its proper divisors (599035).

31745993 is an equidigital number, since it uses as much as digits as its factorization.

31745993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599034.

The product of its digits is 102060, while the sum is 41.

The square root of 31745993 is about 5634.3582598198. The cubic root of 31745993 is about 316.6379550454.

The spelling of 31745993 in words is "thirty-one million, seven hundred forty-five thousand, nine hundred ninety-three".