1315719421 has 2 divisors, whose sum is σ = 1315719422. Its totient is φ = 1315719420.

The previous prime is 1315719359. The next prime is 1315719451. The reversal of 1315719421 is 1249175131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1228502500 + 87216921 = 35050^2 + 9339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315719421 - 2⁹ = 1315718909 is a prime.

It is a super-2 number, since 2×1315719421² = 3462235189593150482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1315719451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657859710 + 657859711.

It is an arithmetic number, because the mean of its divisors is an integer number (657859711).

Almost surely, 2^1315719421 is an apocalyptic number.

It is an amenable number.

1315719421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315719421 is an equidigital number, since it uses as much as digits as its factorization.

1315719421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 34.

The square root of 1315719421 is about 36272.8468830336. The cubic root of 1315719421 is about 1095.7742613768.

The spelling of 1315719421 in words is "one billion, three hundred fifteen million, seven hundred nineteen thousand, four hundred twenty-one".