31144445 has 4 divisors (see below), whose sum is σ = 37373340. Its totient is φ = 24915552.

The previous prime is 31144441. The next prime is 31144453. The reversal of 31144445 is 54444113.

It is a happy number.

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 8543929 + 22600516 = 2923^2 + 4754^2 .

It is a cyclic number.

It is not a de Polignac number, because 31144445 - 2² = 31144441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144441) 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, 3114440 + ... + 3114449.

It is an arithmetic number, because the mean of its divisors is an integer number (9343335).

Almost surely, 2^31144445 is an apocalyptic number.

It is an amenable number.

31144445 is a deficient number, since it is larger than the sum of its proper divisors (6228895).

31144445 is an equidigital number, since it uses as much as digits as its factorization.

31144445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6228894.

The product of its digits is 3840, while the sum is 26.

The square root of 31144445 is about 5580.7208315772. The cubic root of 31144445 is about 314.6252198464.

Adding to 31144445 its reverse (54444113), we get a palindrome (85588558).

The spelling of 31144445 in words is "thirty-one million, one hundred forty-four thousand, four hundred forty-five".