225738991 has 2 divisors, whose sum is σ = 225738992. Its totient is φ = 225738990.

The previous prime is 225738973. The next prime is 225739061. The reversal of 225738991 is 199837522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 225738991 - 2⁹ = 225738479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225738901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112869495 + 112869496.

It is an arithmetic number, because the mean of its divisors is an integer number (112869496).

Almost surely, 2^225738991 is an apocalyptic number.

225738991 is a deficient number, since it is larger than the sum of its proper divisors (1).

225738991 is an equidigital number, since it uses as much as digits as its factorization.

225738991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 225738991 is about 15024.6128402698. The cubic root of 225738991 is about 608.8853522534.

The spelling of 225738991 in words is "two hundred twenty-five million, seven hundred thirty-eight thousand, nine hundred ninety-one".