1297197719 has 4 divisors (see below), whose sum is σ = 1298006544. Its totient is φ = 1296388896.

The previous prime is 1297197709. The next prime is 1297197731. The reversal of 1297197719 is 9177917921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1297197719 - 2⁴ = 1297197703 is a prime.

It is a super-2 number, since 2×1297197719² = 3365443844357605922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297197709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402002 + ... + 405215.

It is an arithmetic number, because the mean of its divisors is an integer number (324501636).

Almost surely, 2^1297197719 is an apocalyptic number.

1297197719 is a deficient number, since it is larger than the sum of its proper divisors (808825).

1297197719 is an equidigital number, since it uses as much as digits as its factorization.

1297197719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808824.

The product of its digits is 500094, while the sum is 53.

The square root of 1297197719 is about 36016.6311445143. The cubic root of 1297197719 is about 1090.6081164635.

The spelling of 1297197719 in words is "one billion, two hundred ninety-seven million, one hundred ninety-seven thousand, seven hundred nineteen".