1261997 has 8 divisors (see below), whose sum is σ = 1406592. Its totient is φ = 1122400.

The previous prime is 1261973. The next prime is 1262011. The reversal of 1261997 is 7991621.

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 1261997 - 2⁶ = 1261933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261697) 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, 704 + ... + 1737.

It is an arithmetic number, because the mean of its divisors is an integer number (175824).

2^1261997 is an apocalyptic number.

It is an amenable number.

1261997 is a deficient number, since it is larger than the sum of its proper divisors (144595).

1261997 is a wasteful number, since it uses less digits than its factorization.

1261997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499.

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

The square root of 1261997 is about 1123.3863983510. The cubic root of 1261997 is about 108.0652611968.

The spelling of 1261997 in words is "one million, two hundred sixty-one thousand, nine hundred ninety-seven".