315221453 has 2 divisors, whose sum is σ = 315221454. Its totient is φ = 315221452.

The previous prime is 315221449. The next prime is 315221461. The reversal of 315221453 is 354122513.

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., 274299844 + 40921609 = 16562^2 + 6397^2 .

It is a cyclic number.

It is not a de Polignac number, because 315221453 - 2² = 315221449 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315221443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157610726 + 157610727.

It is an arithmetic number, because the mean of its divisors is an integer number (157610727).

Almost surely, 2^315221453 is an apocalyptic number.

It is an amenable number.

315221453 is a deficient number, since it is larger than the sum of its proper divisors (1).

315221453 is an equidigital number, since it uses as much as digits as its factorization.

315221453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 26.

The square root of 315221453 is about 17754.4769846932. The cubic root of 315221453 is about 680.5686225632.

Adding to 315221453 its reverse (354122513), we get a palindrome (669343966).

The spelling of 315221453 in words is "three hundred fifteen million, two hundred twenty-one thousand, four hundred fifty-three".