225129973 has 2 divisors, whose sum is σ = 225129974. Its totient is φ = 225129972.

The previous prime is 225129943. The next prime is 225129991. The reversal of 225129973 is 379921522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204861969 + 20268004 = 14313^2 + 4502^2 .

It is a cyclic number.

It is not a de Polignac number, because 225129973 - 2¹⁷ = 224998901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225129923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112564986 + 112564987.

It is an arithmetic number, because the mean of its divisors is an integer number (112564987).

Almost surely, 2^225129973 is an apocalyptic number.

It is an amenable number.

225129973 is a deficient number, since it is larger than the sum of its proper divisors (1).

225129973 is an equidigital number, since it uses as much as digits as its factorization.

225129973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 225129973 is about 15004.3318078480. The cubic root of 225129973 is about 608.3372913902.

The spelling of 225129973 in words is "two hundred twenty-five million, one hundred twenty-nine thousand, nine hundred seventy-three".