31228145 has 16 divisors (see below), whose sum is σ = 40500432. Its totient is φ = 22978560.

The previous prime is 31228139. The next prime is 31228177. The reversal of 31228145 is 54182213.

It can be written as a sum of positive squares in 8 ways, for example, as 7011904 + 24216241 = 2648^2 + 4921^2 .

It is not a de Polignac number, because 31228145 - 2⁶ = 31228081 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, 22265 + ... + 23625.

It is an arithmetic number, because the mean of its divisors is an integer number (2531277).

Almost surely, 2^31228145 is an apocalyptic number.

It is an amenable number.

31228145 is a deficient number, since it is larger than the sum of its proper divisors (9272287).

31228145 is a wasteful number, since it uses less digits than its factorization.

31228145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732.

The product of its digits is 1920, while the sum is 26.

The square root of 31228145 is about 5588.2148312319. The cubic root of 31228145 is about 314.9068171507.

The spelling of 31228145 in words is "thirty-one million, two hundred twenty-eight thousand, one hundred forty-five".