11563431 has 32 divisors (see below), whose sum is σ = 17867520. Its totient is φ = 6585600.

The previous prime is 11563427. The next prime is 11563441. The reversal of 11563431 is 13436511.

11563431 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11563431 - 2² = 11563427 is a prime.

It is a super-2 number, since 2×11563431² = 267425872983522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11563441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41011 + ... + 41291.

It is an arithmetic number, because the mean of its divisors is an integer number (558360).

Almost surely, 2^11563431 is an apocalyptic number.

11563431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11563431 is a deficient number, since it is larger than the sum of its proper divisors (6304089).

11563431 is a wasteful number, since it uses less digits than its factorization.

11563431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its digits is 1080, while the sum is 24.

The square root of 11563431 is about 3400.5045213909. The cubic root of 11563431 is about 226.1321113914.

Adding to 11563431 its reverse (13436511), we get a palindrome (24999942).

Subtracting 11563431 from its reverse (13436511), we obtain a triangular number (1873080 = T₁₉₃₅).

It can be divided in two parts, 115 and 63431, that added together give a triangular number (63546 = T₃₅₆).

The spelling of 11563431 in words is "eleven million, five hundred sixty-three thousand, four hundred thirty-one".