1263521 has 4 divisors (see below), whose sum is σ = 1444032. Its totient is φ = 1083012.

The previous prime is 1263511. The next prime is 1263539. The reversal of 1263521 is 1253621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-1263521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1263493 and 1263502.

It is not an unprimeable number, because it can be changed into a prime (1263511) 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, 90245 + ... + 90258.

It is an arithmetic number, because the mean of its divisors is an integer number (361008).

2^1263521 is an apocalyptic number.

It is an amenable number.

1263521 is a deficient number, since it is larger than the sum of its proper divisors (180511).

1263521 is an equidigital number, since it uses as much as digits as its factorization.

1263521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180510.

The product of its digits is 360, while the sum is 20.

The square root of 1263521 is about 1124.0644999287. The cubic root of 1263521 is about 108.1087439225.

The spelling of 1263521 in words is "one million, two hundred sixty-three thousand, five hundred twenty-one".