315623325443221 has 2 divisors, whose sum is σ = 315623325443222. Its totient is φ = 315623325443220.

The previous prime is 315623325443203. The next prime is 315623325443287. The reversal of 315623325443221 is 122344523326513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313453923436900 + 2169402006321 = 17704630^2 + 1472889^2 .

It is a cyclic number.

It is not a de Polignac number, because 315623325443221 - 2¹⁹ = 315623324918933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315623325443521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157811662721610 + 157811662721611.

It is an arithmetic number, because the mean of its divisors is an integer number (157811662721611).

Almost surely, 2^{315623325443221} is an apocalyptic number.

It is an amenable number.

315623325443221 is a deficient number, since it is larger than the sum of its proper divisors (1).

315623325443221 is an equidigital number, since it uses as much as digits as its factorization.

315623325443221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3110400, while the sum is 46.

Adding to 315623325443221 its reverse (122344523326513), we get a palindrome (437967848769734).

The spelling of 315623325443221 in words is "three hundred fifteen trillion, six hundred twenty-three billion, three hundred twenty-five million, four hundred forty-three thousand, two hundred twenty-one".