1263553 has 4 divisors (see below), whose sum is σ = 1282480. Its totient is φ = 1244628.

The previous prime is 1263547. The next prime is 1263569. The reversal of 1263553 is 3553621.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3553621 = 71 ⋅50051.

It is a cyclic number.

It is not a de Polignac number, because 1263553 - 2¹³ = 1255361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263503) 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, 9363 + ... + 9496.

It is an arithmetic number, because the mean of its divisors is an integer number (320620).

2^1263553 is an apocalyptic number.

It is an amenable number.

1263553 is a deficient number, since it is larger than the sum of its proper divisors (18927).

1263553 is an equidigital number, since it uses as much as digits as its factorization.

1263553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18926.

The product of its digits is 2700, while the sum is 25.

The square root of 1263553 is about 1124.0787338972. The cubic root of 1263553 is about 108.1096565707.

The spelling of 1263553 in words is "one million, two hundred sixty-three thousand, five hundred fifty-three".