31163225 has 6 divisors (see below), whose sum is σ = 38642430. Its totient is φ = 24930560.

The previous prime is 31163221. The next prime is 31163267. The reversal of 31163225 is 52236113.

It can be written as a sum of positive squares in 3 ways, for example, as 2572816 + 28590409 = 1604^2 + 5347^2 .

It is not a de Polignac number, because 31163225 - 2² = 31163221 is a prime.

It is a super-2 number, since 2×31163225² = 1942293184801250, 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 31163225.

It is not an unprimeable number, because it can be changed into a prime (31163221) 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, 623240 + ... + 623289.

It is an arithmetic number, because the mean of its divisors is an integer number (6440405).

Almost surely, 2^31163225 is an apocalyptic number.

It is an amenable number.

31163225 is a deficient number, since it is larger than the sum of its proper divisors (7479205).

31163225 is a wasteful number, since it uses less digits than its factorization.

31163225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246539 (or 1246534 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 31163225 is about 5582.4031563476. The cubic root of 31163225 is about 314.6884464710.

Adding to 31163225 its reverse (52236113), we get a palindrome (83399338).

It can be divided in two parts, 311 and 63225, that added together give a palindrome (63536).

The spelling of 31163225 in words is "thirty-one million, one hundred sixty-three thousand, two hundred twenty-five".