225138751 has 4 divisors (see below), whose sum is σ = 225446632. Its totient is φ = 224830872.

The previous prime is 225138713. The next prime is 225138779. The reversal of 225138751 is 157831522.

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 225138751 - 2⁷ = 225138623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225148751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152841 + ... + 154306.

It is an arithmetic number, because the mean of its divisors is an integer number (56361658).

Almost surely, 2^225138751 is an apocalyptic number.

225138751 is a deficient number, since it is larger than the sum of its proper divisors (307881).

225138751 is an equidigital number, since it uses as much as digits as its factorization.

225138751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307880.

The product of its digits is 16800, while the sum is 34.

The square root of 225138751 is about 15004.6243205220. The cubic root of 225138751 is about 608.3451978087.

The spelling of 225138751 in words is "two hundred twenty-five million, one hundred thirty-eight thousand, seven hundred fifty-one".