31552993 has 4 divisors (see below), whose sum is σ = 31842580. Its totient is φ = 31263408.

The previous prime is 31552943. The next prime is 31552999. The reversal of 31552993 is 39925513.

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 21743569 + 9809424 = 4663^2 + 3132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31552993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31552999) 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, 144630 + ... + 144847.

It is an arithmetic number, because the mean of its divisors is an integer number (7960645).

Almost surely, 2^31552993 is an apocalyptic number.

It is an amenable number.

31552993 is a deficient number, since it is larger than the sum of its proper divisors (289587).

31552993 is a wasteful number, since it uses less digits than its factorization.

31552993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289586.

The product of its digits is 36450, while the sum is 37.

The square root of 31552993 is about 5617.2050879419. The cubic root of 31552993 is about 315.9949826955.

The spelling of 31552993 in words is "thirty-one million, five hundred fifty-two thousand, nine hundred ninety-three".