312542521 has 2 divisors, whose sum is σ = 312542522. Its totient is φ = 312542520.

The previous prime is 312542513. The next prime is 312542539. The reversal of 312542521 is 125245213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312016896 + 525625 = 17664^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 312542521 - 2³ = 312542513 is a prime.

It is not a weakly prime, because it can be changed into another prime (312542591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156271260 + 156271261.

It is an arithmetic number, because the mean of its divisors is an integer number (156271261).

Almost surely, 2^312542521 is an apocalyptic number.

It is an amenable number.

312542521 is a deficient number, since it is larger than the sum of its proper divisors (1).

312542521 is an equidigital number, since it uses as much as digits as its factorization.

312542521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 312542521 is about 17678.8721642530. The cubic root of 312542521 is about 678.6351813532.

Adding to 312542521 its reverse (125245213), we get a palindrome (437787734).

The spelling of 312542521 in words is "three hundred twelve million, five hundred forty-two thousand, five hundred twenty-one".