225236731 has 4 divisors (see below), whose sum is σ = 232502464. Its totient is φ = 217971000.

The previous prime is 225236729. The next prime is 225236743. The reversal of 225236731 is 137632522.

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 225236731 - 2¹ = 225236729 is a prime.

It is a super-2 number, since 2×225236731² = 101463169983132722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 7265701 = 225236731 / (2 + 2 + 5 + 2 + 3 + 6 + 7 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225236693 and 225236702.

It is not an unprimeable number, because it can be changed into a prime (225236701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3632820 + ... + 3632881.

It is an arithmetic number, because the mean of its divisors is an integer number (58125616).

Almost surely, 2^225236731 is an apocalyptic number.

225236731 is a deficient number, since it is larger than the sum of its proper divisors (7265733).

225236731 is an equidigital number, since it uses as much as digits as its factorization.

225236731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7265732.

The product of its digits is 15120, while the sum is 31.

The square root of 225236731 is about 15007.8889588110. Note that the first 3 decimals coincide. The cubic root of 225236731 is about 608.4334352734.

It can be divided in two parts, 2252 and 36731, that added together give a palindrome (38983).

The spelling of 225236731 in words is "two hundred twenty-five million, two hundred thirty-six thousand, seven hundred thirty-one".