316525421 has 2 divisors, whose sum is σ = 316525422. Its totient is φ = 316525420.

The previous prime is 316525393. The next prime is 316525423. The reversal of 316525421 is 124525613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262796521 + 53728900 = 16211^2 + 7330^2 .

It is an emirp because it is prime and its reverse (124525613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 316525421 - 2⁶ = 316525357 is a prime.

It is a Sophie Germain prime.

Together with 316525423, it forms a pair of twin primes.

It is a Chen 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 (316525423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158262710 + 158262711.

It is an arithmetic number, because the mean of its divisors is an integer number (158262711).

Almost surely, 2^316525421 is an apocalyptic number.

It is an amenable number.

316525421 is a deficient number, since it is larger than the sum of its proper divisors (1).

316525421 is an equidigital number, since it uses as much as digits as its factorization.

316525421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 316525421 is about 17791.1613167887. The cubic root of 316525421 is about 681.5057614319.

It can be divided in two parts, 31652 and 5421, that added together give a palindrome (37073).

The spelling of 316525421 in words is "three hundred sixteen million, five hundred twenty-five thousand, four hundred twenty-one".