31223125 has 10 divisors (see below), whose sum is σ = 39017198. Its totient is φ = 24978000.

The previous prime is 31223123. The next prime is 31223131. The reversal of 31223125 is 52132213.

It can be written as a sum of positive squares in 5 ways, for example, as 16176484 + 15046641 = 4022^2 + 3879^2 .

It is not a de Polignac number, because 31223125 - 2¹ = 31223123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223123) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24354 + ... + 25603.

Almost surely, 2^31223125 is an apocalyptic number.

It is an amenable number.

31223125 is a deficient number, since it is larger than the sum of its proper divisors (7794073).

31223125 is an frugal number, since it uses more digits than its factorization.

31223125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49977 (or 49962 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 31223125 is about 5587.7656536401. The cubic root of 31223125 is about 314.8899422351.

Adding to 31223125 its reverse (52132213), we get a palindrome (83355338).

The spelling of 31223125 in words is "thirty-one million, two hundred twenty-three thousand, one hundred twenty-five".