313515421 has 2 divisors, whose sum is σ = 313515422. Its totient is φ = 313515420.

The previous prime is 313515403. The next prime is 313515443. The reversal of 313515421 is 124515313.

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., 184579396 + 128936025 = 13586^2 + 11355^2 .

It is a cyclic number.

It is not a de Polignac number, because 313515421 - 2¹¹ = 313513373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313515721) 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, 156757710 + 156757711.

It is an arithmetic number, because the mean of its divisors is an integer number (156757711).

Almost surely, 2^313515421 is an apocalyptic number.

It is an amenable number.

313515421 is a deficient number, since it is larger than the sum of its proper divisors (1).

313515421 is an equidigital number, since it uses as much as digits as its factorization.

313515421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 313515421 is about 17706.3666798132. The cubic root of 313515421 is about 679.3386165918.

The spelling of 313515421 in words is "three hundred thirteen million, five hundred fifteen thousand, four hundred twenty-one".