1263281 has 4 divisors (see below), whose sum is σ = 1304064. Its totient is φ = 1222500.

The previous prime is 1263263. The next prime is 1263299. The reversal of 1263281 is 1823621.

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 an interprime number because it is at equal distance from previous prime (1263263) and next prime (1263299).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263281 is a prime.

It is a super-2 number, since 2×1263281² = 3191757769922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263181) 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, 20345 + ... + 20406.

It is an arithmetic number, because the mean of its divisors is an integer number (326016).

2^1263281 is an apocalyptic number.

It is an amenable number.

1263281 is a deficient number, since it is larger than the sum of its proper divisors (40783).

1263281 is an equidigital number, since it uses as much as digits as its factorization.

1263281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40782.

The product of its digits is 576, while the sum is 23.

The square root of 1263281 is about 1123.9577394191. The cubic root of 1263281 is about 108.1018985696.

It can be divided in two parts, 1263 and 281, that multiplied together give a triangular number (354903 = T₈₄₂).

The spelling of 1263281 in words is "one million, two hundred sixty-three thousand, two hundred eighty-one".