225916129 has 2 divisors, whose sum is σ = 225916130. Its totient is φ = 225916128.

The previous prime is 225916037. The next prime is 225916217. The reversal of 225916129 is 921619522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205979904 + 19936225 = 14352^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 225916129 - 2¹³ = 225907937 is a prime.

It is not a weakly prime, because it can be changed into another prime (225916829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112958064 + 112958065.

It is an arithmetic number, because the mean of its divisors is an integer number (112958065).

Almost surely, 2^225916129 is an apocalyptic number.

It is an amenable number.

225916129 is a deficient number, since it is larger than the sum of its proper divisors (1).

225916129 is an equidigital number, since it uses as much as digits as its factorization.

225916129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 225916129 is about 15030.5066115550. The cubic root of 225916129 is about 609.0445752768.

The spelling of 225916129 in words is "two hundred twenty-five million, nine hundred sixteen thousand, one hundred twenty-nine".