1297691 has 8 divisors (see below), whose sum is σ = 1373568. Its totient is φ = 1224000.

The previous prime is 1297687. The next prime is 1297693. The reversal of 1297691 is 1967921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1297691 - 2² = 1297687 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 (1297693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 761 + ... + 1781.

It is an arithmetic number, because the mean of its divisors is an integer number (171696).

2^1297691 is an apocalyptic number.

1297691 is a deficient number, since it is larger than the sum of its proper divisors (75877).

1297691 is a wasteful number, since it uses less digits than its factorization.

1297691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093.

The product of its digits is 6804, while the sum is 35.

The square root of 1297691 is about 1139.1624115990. The cubic root of 1297691 is about 109.0746339567.

The spelling of 1297691 in words is "one million, two hundred ninety-seven thousand, six hundred ninety-one".