225736691 has 4 divisors (see below), whose sum is σ = 226705752. Its totient is φ = 224767632.

The previous prime is 225736673. The next prime is 225736729. The reversal of 225736691 is 196637522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196637522 = 2 ⋅98318761.

It is a cyclic number.

It is not a de Polignac number, because 225736691 - 2¹⁰ = 225735667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225736631) 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, 484181 + ... + 484646.

It is an arithmetic number, because the mean of its divisors is an integer number (56676438).

Almost surely, 2^225736691 is an apocalyptic number.

225736691 is a deficient number, since it is larger than the sum of its proper divisors (969061).

225736691 is an equidigital number, since it uses as much as digits as its factorization.

225736691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969060.

The product of its digits is 136080, while the sum is 41.

The square root of 225736691 is about 15024.5362990010. The cubic root of 225736691 is about 608.8832843178.

The spelling of 225736691 in words is "two hundred twenty-five million, seven hundred thirty-six thousand, six hundred ninety-one".