1263531 has 4 divisors (see below), whose sum is σ = 1684712. Its totient is φ = 842352.

The previous prime is 1263511. The next prime is 1263539. The reversal of 1263531 is 1353621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1353621 = 3 ⋅451207.

It is not a de Polignac number, because 1263531 - 2⁵ = 1263499 is a prime.

It is a super-2 number, since 2×1263531² = 3193021175922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1263498 and 1263507.

It is not an unprimeable number, because it can be changed into a prime (1263539) 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, 210586 + ... + 210591.

It is an arithmetic number, because the mean of its divisors is an integer number (421178).

2^1263531 is an apocalyptic number.

1263531 is a deficient number, since it is larger than the sum of its proper divisors (421181).

1263531 is an equidigital number, since it uses as much as digits as its factorization.

1263531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421180.

The product of its digits is 540, while the sum is 21.

The square root of 1263531 is about 1124.0689480632. The cubic root of 1263531 is about 108.1090291267.

The spelling of 1263531 in words is "one million, two hundred sixty-three thousand, five hundred thirty-one".