1291257 has 12 divisors (see below), whose sum is σ = 2034864. Its totient is φ = 782520.

The previous prime is 1291249. The next prime is 1291271. The reversal of 1291257 is 7521921.

It is not a de Polignac number, because 1291257 - 2³ = 1291249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1291257.

It is not an unprimeable number, because it can be changed into a prime (1291217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6423 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (169572).

2^1291257 is an apocalyptic number.

It is an amenable number.

1291257 is a deficient number, since it is larger than the sum of its proper divisors (743607).

1291257 is a wasteful number, since it uses less digits than its factorization.

1291257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13060 (or 13057 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 1291257 is about 1136.3348978184. The cubic root of 1291257 is about 108.8940698554.

The spelling of 1291257 in words is "one million, two hundred ninety-one thousand, two hundred fifty-seven".