31440145 has 16 divisors (see below), whose sum is σ = 41274432. Its totient is φ = 22800960.

The previous prime is 31440127. The next prime is 31440161. The reversal of 31440145 is 54104413.

It is not a de Polignac number, because 31440145 - 2¹⁷ = 31309073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28219 + ... + 29311.

It is an arithmetic number, because the mean of its divisors is an integer number (2579652).

Almost surely, 2^31440145 is an apocalyptic number.

It is an amenable number.

31440145 is a deficient number, since it is larger than the sum of its proper divisors (9834287).

31440145 is a wasteful number, since it uses less digits than its factorization.

31440145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 31440145 is about 5607.1512374824. The cubic root of 31440145 is about 315.6178182858.

Adding to 31440145 its reverse (54104413), we get a palindrome (85544558).

The spelling of 31440145 in words is "thirty-one million, four hundred forty thousand, one hundred forty-five".