11228731 has 4 divisors (see below), whose sum is σ = 11396392. Its totient is φ = 11061072.

The previous prime is 11228689. The next prime is 11228743. The reversal of 11228731 is 13782211.

It is a happy number.

11228731 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11228731 - 2²¹ = 9131579 is a prime.

It is a super-2 number, since 2×11228731² = 252168799740722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11228696 and 11228705.

It is not an unprimeable number, because it can be changed into a prime (11228831) 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, 83730 + ... + 83863.

It is an arithmetic number, because the mean of its divisors is an integer number (2849098).

Almost surely, 2^11228731 is an apocalyptic number.

11228731 is a deficient number, since it is larger than the sum of its proper divisors (167661).

11228731 is an equidigital number, since it uses as much as digits as its factorization.

11228731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167660.

The product of its digits is 672, while the sum is 25.

The square root of 11228731 is about 3350.9298709463. The cubic root of 11228731 is about 223.9289408426.

The spelling of 11228731 in words is "eleven million, two hundred twenty-eight thousand, seven hundred thirty-one".