31122725 has 6 divisors (see below), whose sum is σ = 38592210. Its totient is φ = 24898160.

The previous prime is 31122719. The next prime is 31122727. The reversal of 31122725 is 52722113.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 231361 + 30891364 = 481^2 + 5558^2 .

It is not a de Polignac number, because 31122725 - 2¹² = 31118629 is a prime.

It is a super-2 number, since 2×31122725² = 1937248022851250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31122725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622430 + ... + 622479.

It is an arithmetic number, because the mean of its divisors is an integer number (6432035).

Almost surely, 2^31122725 is an apocalyptic number.

It is an amenable number.

31122725 is a deficient number, since it is larger than the sum of its proper divisors (7469485).

31122725 is a wasteful number, since it uses less digits than its factorization.

31122725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244919 (or 1244914 counting only the distinct ones).

The product of its digits is 840, while the sum is 23.

The square root of 31122725 is about 5578.7745070042. The cubic root of 31122725 is about 314.5520634191.

Adding to 31122725 its reverse (52722113), we get a palindrome (83844838).

The spelling of 31122725 in words is "thirty-one million, one hundred twenty-two thousand, seven hundred twenty-five".