1263491 has 4 divisors (see below), whose sum is σ = 1337832. Its totient is φ = 1189152.

The previous prime is 1263487. The next prime is 1263499. The reversal of 1263491 is 1943621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1943621 = 457 ⋅4253.

It is a cyclic number.

It is not a de Polignac number, because 1263491 - 2² = 1263487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1263491.

It is not an unprimeable number, because it can be changed into a prime (1263499) 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, 37145 + ... + 37178.

It is an arithmetic number, because the mean of its divisors is an integer number (334458).

2^1263491 is an apocalyptic number.

1263491 is a deficient number, since it is larger than the sum of its proper divisors (74341).

1263491 is an equidigital number, since it uses as much as digits as its factorization.

1263491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74340.

The product of its digits is 1296, while the sum is 26.

The square root of 1263491 is about 1124.0511554195. The cubic root of 1263491 is about 108.1078883008.

The spelling of 1263491 in words is "one million, two hundred sixty-three thousand, four hundred ninety-one".