31544145 has 24 divisors (see below), whose sum is σ = 55104192. Its totient is φ = 16692000.

The previous prime is 31544131. The next prime is 31544153. The reversal of 31544145 is 54144513.

It is a happy number.

It is not a de Polignac number, because 31544145 - 2¹⁵ = 31511377 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3220 + ... + 8570.

It is an arithmetic number, because the mean of its divisors is an integer number (2296008).

Almost surely, 2^31544145 is an apocalyptic number.

It is an amenable number.

31544145 is a deficient number, since it is larger than the sum of its proper divisors (23560047).

31544145 is a wasteful number, since it uses less digits than its factorization.

31544145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5493 (or 5490 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 31544145 is about 5616.4174524335. The cubic root of 31544145 is about 315.9654431313.

Adding to 31544145 its reverse (54144513), we get a palindrome (85688658).

The spelling of 31544145 in words is "thirty-one million, five hundred forty-four thousand, one hundred forty-five".