31445 has 8 divisors (see below), whose sum is σ = 39840. Its totient is φ = 23760.

The previous prime is 31397. The next prime is 31469. The reversal of 31445 is 54413.

31445 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 31445 - 2⁸ = 31189 is a prime.

31445 is strictly pandigital in base 6.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71 + ... + 260.

It is an arithmetic number, because the mean of its divisors is an integer number (4980).

2³¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

31445 is a deficient number, since it is larger than the sum of its proper divisors (8395).

31445 is a wasteful number, since it uses less digits than its factorization.

31445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355.

The product of its digits is 240, while the sum is 17.

The square root of 31445 is about 177.3273808525. The cubic root of 31445 is about 31.5634063394.

Adding to 31445 its reverse (54413), we get a palindrome (85858).

The spelling of 31445 in words is "thirty-one thousand, four hundred forty-five".