1297293643 has 4 divisors (see below), whose sum is σ = 1297378368. Its totient is φ = 1297208920.

The previous prime is 1297293629. The next prime is 1297293677. The reversal of 1297293643 is 3463927921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3463927921 = 127 ⋅27275023.

It is a cyclic number.

It is not a de Polignac number, because 1297293643 - 2¹⁷ = 1297162571 is a prime.

It is a super-2 number, since 2×1297293643² = 3365941592336422898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1297293593 and 1297293602.

It is not an unprimeable number, because it can be changed into a prime (1297293623) 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, 12268 + ... + 52393.

It is an arithmetic number, because the mean of its divisors is an integer number (324344592).

Almost surely, 2^1297293643 is an apocalyptic number.

1297293643 is a deficient number, since it is larger than the sum of its proper divisors (84725).

1297293643 is an equidigital number, since it uses as much as digits as its factorization.

1297293643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84724.

The product of its digits is 489888, while the sum is 46.

The square root of 1297293643 is about 36017.9627824784. The cubic root of 1297293643 is about 1090.6349982340.

The spelling of 1297293643 in words is "one billion, two hundred ninety-seven million, two hundred ninety-three thousand, six hundred forty-three".