31252121 has 2 divisors, whose sum is σ = 31252122. Its totient is φ = 31252120.

The previous prime is 31252097. The next prime is 31252159. The reversal of 31252121 is 12125213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26925721 + 4326400 = 5189^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 31252121 - 2¹⁰ = 31251097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31252121.

It is not a weakly prime, because it can be changed into another prime (31252181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15626060 + 15626061.

It is an arithmetic number, because the mean of its divisors is an integer number (15626061).

Almost surely, 2^31252121 is an apocalyptic number.

It is an amenable number.

31252121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31252121 is an equidigital number, since it uses as much as digits as its factorization.

31252121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 17.

The square root of 31252121 is about 5590.3596485378. The cubic root of 31252121 is about 314.9873884260.

Adding to 31252121 its reverse (12125213), we get a palindrome (43377334).

It can be divided in two parts, 3125212 and 1, that added together give a palindrome (3125213).

The spelling of 31252121 in words is "thirty-one million, two hundred fifty-two thousand, one hundred twenty-one".