225391381 has 2 divisors, whose sum is σ = 225391382. Its totient is φ = 225391380.

The previous prime is 225391349. The next prime is 225391403. The reversal of 225391381 is 183193522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215208900 + 10182481 = 14670^2 + 3191^2 .

It is a cyclic number.

It is not a de Polignac number, because 225391381 - 2⁵ = 225391349 is a prime.

It is a super-2 number, since 2×225391381² = 101602549258174322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225391081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112695690 + 112695691.

It is an arithmetic number, because the mean of its divisors is an integer number (112695691).

Almost surely, 2^225391381 is an apocalyptic number.

It is an amenable number.

225391381 is a deficient number, since it is larger than the sum of its proper divisors (1).

225391381 is an equidigital number, since it uses as much as digits as its factorization.

225391381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 225391381 is about 15013.0403649627. The cubic root of 225391381 is about 608.5726557626.

The spelling of 225391381 in words is "two hundred twenty-five million, three hundred ninety-one thousand, three hundred eighty-one".