1421315509 has 2 divisors, whose sum is σ = 1421315510. Its totient is φ = 1421315508.

The previous prime is 1421315503. The next prime is 1421315543. The reversal of 1421315509 is 9055131241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1307039409 + 114276100 = 36153^2 + 10690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421315509 - 2⁹ = 1421314997 is a prime.

It is a super-2 number, since 2×1421315509² = 4040275552247858162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421315503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710657754 + 710657755.

It is an arithmetic number, because the mean of its divisors is an integer number (710657755).

Almost surely, 2^1421315509 is an apocalyptic number.

It is an amenable number.

1421315509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421315509 is an equidigital number, since it uses as much as digits as its factorization.

1421315509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1421315509 is about 37700.3383141319. The cubic root of 1421315509 is about 1124.3378514048.

The spelling of 1421315509 in words is "one billion, four hundred twenty-one million, three hundred fifteen thousand, five hundred nine".