225121717 has 2 divisors, whose sum is σ = 225121718. Its totient is φ = 225121716.

The previous prime is 225121711. The next prime is 225121739. The reversal of 225121717 is 717121522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220255281 + 4866436 = 14841^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 225121717 - 2¹⁵ = 225088949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225121711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112560858 + 112560859.

It is an arithmetic number, because the mean of its divisors is an integer number (112560859).

Almost surely, 2^225121717 is an apocalyptic number.

It is an amenable number.

225121717 is a deficient number, since it is larger than the sum of its proper divisors (1).

225121717 is an equidigital number, since it uses as much as digits as its factorization.

225121717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1960, while the sum is 28.

The square root of 225121717 is about 15004.0566847770. The cubic root of 225121717 is about 608.3298549539.

The spelling of 225121717 in words is "two hundred twenty-five million, one hundred twenty-one thousand, seven hundred seventeen".