225661511 has 2 divisors, whose sum is σ = 225661512. Its totient is φ = 225661510.

The previous prime is 225661481. The next prime is 225661529. The reversal of 225661511 is 115166522.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225661511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225661531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112830755 + 112830756.

It is an arithmetic number, because the mean of its divisors is an integer number (112830756).

Almost surely, 2^225661511 is an apocalyptic number.

225661511 is a deficient number, since it is larger than the sum of its proper divisors (1).

225661511 is an equidigital number, since it uses as much as digits as its factorization.

225661511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 225661511 is about 15022.0341831591. The cubic root of 225661511 is about 608.8156820628.

The spelling of 225661511 in words is "two hundred twenty-five million, six hundred sixty-one thousand, five hundred eleven".