31452121 has 2 divisors, whose sum is σ = 31452122. Its totient is φ = 31452120.

The previous prime is 31452097. The next prime is 31452131. The reversal of 31452121 is 12125413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 15492096 = 3995^2 + 3936^2 .

It is an emirp because it is prime and its reverse (12125413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31452121 - 2⁵ = 31452089 is a prime.

It is not a weakly prime, because it can be changed into another prime (31452131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15726060 + 15726061.

It is an arithmetic number, because the mean of its divisors is an integer number (15726061).

Almost surely, 2^31452121 is an apocalyptic number.

It is an amenable number.

31452121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31452121 is an equidigital number, since it uses as much as digits as its factorization.

31452121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 19.

The square root of 31452121 is about 5608.2190577758. The cubic root of 31452121 is about 315.6578876425.

Adding to 31452121 its reverse (12125413), we get a palindrome (43577534).

The spelling of 31452121 in words is "thirty-one million, four hundred fifty-two thousand, one hundred twenty-one".