315221461 has 2 divisors, whose sum is σ = 315221462. Its totient is φ = 315221460.

The previous prime is 315221453. The next prime is 315221471. The reversal of 315221461 is 164122513.

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., 292239025 + 22982436 = 17095^2 + 4794^2 .

It is a cyclic number.

It is not a de Polignac number, because 315221461 - 2³ = 315221453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315221471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157610730 + 157610731.

It is an arithmetic number, because the mean of its divisors is an integer number (157610731).

Almost surely, 2^315221461 is an apocalyptic number.

It is an amenable number.

315221461 is a deficient number, since it is larger than the sum of its proper divisors (1).

315221461 is an equidigital number, since it uses as much as digits as its factorization.

315221461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 315221461 is about 17754.4772099885. The cubic root of 315221461 is about 680.5686283206.

Adding to 315221461 its reverse (164122513), we get a palindrome (479343974).

The spelling of 315221461 in words is "three hundred fifteen million, two hundred twenty-one thousand, four hundred sixty-one".