31321345 has 8 divisors (see below), whose sum is σ = 41002560. Its totient is φ = 22779120.

The previous prime is 31321321. The next prime is 31321349. The reversal of 31321345 is 54312313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31321345 - 2⁵ = 31321313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31321349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284685 + ... + 284794.

It is an arithmetic number, because the mean of its divisors is an integer number (5125320).

Almost surely, 2^31321345 is an apocalyptic number.

It is an amenable number.

31321345 is a deficient number, since it is larger than the sum of its proper divisors (9681215).

31321345 is a wasteful number, since it uses less digits than its factorization.

31321345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569495.

The product of its digits is 1080, while the sum is 22.

The square root of 31321345 is about 5596.5475965098. The cubic root of 31321345 is about 315.2197844661.

Adding to 31321345 its reverse (54312313), we get a palindrome (85633658).

The spelling of 31321345 in words is "thirty-one million, three hundred twenty-one thousand, three hundred forty-five".