225618761 has 2 divisors, whose sum is σ = 225618762. Its totient is φ = 225618760.

The previous prime is 225618751. The next prime is 225618763. The reversal of 225618761 is 167816522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225570361 + 48400 = 15019^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 225618761 - 2⁶ = 225618697 is a prime.

Together with 225618763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (225618763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112809380 + 112809381.

It is an arithmetic number, because the mean of its divisors is an integer number (112809381).

Almost surely, 2^225618761 is an apocalyptic number.

It is an amenable number.

225618761 is a deficient number, since it is larger than the sum of its proper divisors (1).

225618761 is an equidigital number, since it uses as much as digits as its factorization.

225618761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 225618761 is about 15020.6112059397. The cubic root of 225618761 is about 608.7772343393. Note that the first 3 decimals are identical.

The spelling of 225618761 in words is "two hundred twenty-five million, six hundred eighteen thousand, seven hundred sixty-one".