1297162591 has 4 divisors (see below), whose sum is σ = 1297296000. Its totient is φ = 1297029184.

The previous prime is 1297162583. The next prime is 1297162609. The reversal of 1297162591 is 1952617921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1952617921 = 59 ⋅33095219.

It is a cyclic number.

It is not a de Polignac number, because 1297162591 - 2³ = 1297162583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297162501) 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, 50866 + ... + 71983.

It is an arithmetic number, because the mean of its divisors is an integer number (324324000).

Almost surely, 2^1297162591 is an apocalyptic number.

1297162591 is a deficient number, since it is larger than the sum of its proper divisors (133409).

1297162591 is a wasteful number, since it uses less digits than its factorization.

1297162591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133408.

The product of its digits is 68040, while the sum is 43.

The square root of 1297162591 is about 36016.1434776129. The cubic root of 1297162591 is about 1090.5982718507.

The spelling of 1297162591 in words is "one billion, two hundred ninety-seven million, one hundred sixty-two thousand, five hundred ninety-one".