31284225 has 60 divisors (see below), whose sum is σ = 66257664. Its totient is φ = 14294880.

The previous prime is 31284179. The next prime is 31284229. The reversal of 31284225 is 52248213.

It is not a de Polignac number, because 31284225 - 2⁶ = 31284161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31284229) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 13072 + ... + 15278.

Almost surely, 2^31284225 is an apocalyptic number.

31284225 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31284225 is an abundant number, since it is smaller than the sum of its proper divisors (34973439).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31284225 is a wasteful number, since it uses less digits than its factorization.

31284225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236 (or 2222 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 31284225 is about 5593.2302831190. The cubic root of 31284225 is about 315.0952093152.

The spelling of 31284225 in words is "thirty-one million, two hundred eighty-four thousand, two hundred twenty-five".