226315781 has 4 divisors (see below), whose sum is σ = 239628492. Its totient is φ = 213003072.

The previous prime is 226315741. The next prime is 226315811. The reversal of 226315781 is 187513622.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 172528225 + 53787556 = 13135^2 + 7334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-226315781 is a prime.

It is a super-2 number, since 2×226315781² = 102437665459279922, 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 (226315711) 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, 6656330 + ... + 6656363.

It is an arithmetic number, because the mean of its divisors is an integer number (59907123).

Almost surely, 2^226315781 is an apocalyptic number.

It is an amenable number.

226315781 is a deficient number, since it is larger than the sum of its proper divisors (13312711).

226315781 is a wasteful number, since it uses less digits than its factorization.

226315781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13312710.

The product of its digits is 20160, while the sum is 35.

The square root of 226315781 is about 15043.7954320045. The cubic root of 226315781 is about 609.4035027159.

The spelling of 226315781 in words is "two hundred twenty-six million, three hundred fifteen thousand, seven hundred eighty-one".