315430421 has 2 divisors, whose sum is σ = 315430422. Its totient is φ = 315430420.

The previous prime is 315430417. The next prime is 315430429. The reversal of 315430421 is 124034513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267682321 + 47748100 = 16361^2 + 6910^2 .

It is a cyclic number.

It is not a de Polignac number, because 315430421 - 2² = 315430417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315430429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157715210 + 157715211.

It is an arithmetic number, because the mean of its divisors is an integer number (157715211).

Almost surely, 2^315430421 is an apocalyptic number.

It is an amenable number.

315430421 is a deficient number, since it is larger than the sum of its proper divisors (1).

315430421 is an equidigital number, since it uses as much as digits as its factorization.

315430421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 315430421 is about 17760.3609479087. The cubic root of 315430421 is about 680.7189778639.

Adding to 315430421 its reverse (124034513), we get a palindrome (439464934).

The spelling of 315430421 in words is "three hundred fifteen million, four hundred thirty thousand, four hundred twenty-one".