31231345 has 16 divisors (see below), whose sum is σ = 39588480. Its totient is φ = 23587200.

The previous prime is 31231339. The next prime is 31231349. The reversal of 31231345 is 54313213.

It is not a de Polignac number, because 31231345 - 2¹⁷ = 31100273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31231349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49180 + ... + 49810.

It is an arithmetic number, because the mean of its divisors is an integer number (2474280).

Almost surely, 2^31231345 is an apocalyptic number.

It is an amenable number.

31231345 is a deficient number, since it is larger than the sum of its proper divisors (8357135).

31231345 is a wasteful number, since it uses less digits than its factorization.

31231345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

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

The square root of 31231345 is about 5588.5011407353. The cubic root of 31231345 is about 314.9175731252.

Adding to 31231345 its reverse (54313213), we get a palindrome (85544558).

The spelling of 31231345 in words is "thirty-one million, two hundred thirty-one thousand, three hundred forty-five".