31225745 has 8 divisors (see below), whose sum is σ = 38178216. Its totient is φ = 24509056.

The previous prime is 31225709. The next prime is 31225751. The reversal of 31225745 is 54752213.

It is a happy number.

It is a Cunningham number, because it is equal to 5588²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 234256 + 30991489 = 484^2 + 5567^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31225745 - 2⁶ = 31225681 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58652 + ... + 59181.

It is an arithmetic number, because the mean of its divisors is an integer number (4772277).

Almost surely, 2^31225745 is an apocalyptic number.

It is an amenable number.

31225745 is a deficient number, since it is larger than the sum of its proper divisors (6952471).

31225745 is a wasteful number, since it uses less digits than its factorization.

31225745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117891.

The product of its digits is 8400, while the sum is 29.

The square root of 31225745 is about 5588.0000894775. Note that the first 4 decimals coincide. The cubic root of 31225745 is about 314.8987496876.

Adding to 31225745 its reverse (54752213), we get a palindrome (85977958).

The spelling of 31225745 in words is "thirty-one million, two hundred twenty-five thousand, seven hundred forty-five".