225274781 has 2 divisors, whose sum is σ = 225274782. Its totient is φ = 225274780.

The previous prime is 225274771. The next prime is 225274793. The reversal of 225274781 is 187472522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118483225 + 106791556 = 10885^2 + 10334^2 .

It is a cyclic number.

It is not a de Polignac number, because 225274781 - 2²² = 221080477 is a prime.

It is a super-2 number, since 2×225274781² = 101497453909195922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225274711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112637390 + 112637391.

It is an arithmetic number, because the mean of its divisors is an integer number (112637391).

Almost surely, 2^225274781 is an apocalyptic number.

It is an amenable number.

225274781 is a deficient number, since it is larger than the sum of its proper divisors (1).

225274781 is an equidigital number, since it uses as much as digits as its factorization.

225274781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 38.

The square root of 225274781 is about 15009.1565719064. The cubic root of 225274781 is about 608.4676949145.

The spelling of 225274781 in words is "two hundred twenty-five million, two hundred seventy-four thousand, seven hundred eighty-one".