31272505 has 16 divisors (see below), whose sum is σ = 41053248. Its totient is φ = 22680000.

The previous prime is 31272497. The next prime is 31272517. The reversal of 31272505 is 50527213.

It is not a de Polignac number, because 31272505 - 2³ = 31272497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31272505.

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, 29230 + ... + 30280.

It is an arithmetic number, because the mean of its divisors is an integer number (2565828).

Almost surely, 2^31272505 is an apocalyptic number.

It is an amenable number.

31272505 is a deficient number, since it is larger than the sum of its proper divisors (9780743).

31272505 is a wasteful number, since it uses less digits than its factorization.

31272505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 31272505 is about 5592.1824898692. The cubic root of 31272505 is about 315.0558563920.

Adding to 31272505 its reverse (50527213), we get a palindrome (81799718).

The spelling of 31272505 in words is "thirty-one million, two hundred seventy-two thousand, five hundred five".