225787691 has 2 divisors, whose sum is σ = 225787692. Its totient is φ = 225787690.

The previous prime is 225787687. The next prime is 225787703. The reversal of 225787691 is 196787522.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 225787691 - 2² = 225787687 is a prime.

It is a super-2 number, since 2×225787691² = 101960162814222962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (225787651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112893845 + 112893846.

It is an arithmetic number, because the mean of its divisors is an integer number (112893846).

Almost surely, 2^225787691 is an apocalyptic number.

225787691 is a deficient number, since it is larger than the sum of its proper divisors (1).

225787691 is an equidigital number, since it uses as much as digits as its factorization.

225787691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 225787691 is about 15026.2334269104. The cubic root of 225787691 is about 608.9291352442.

The spelling of 225787691 in words is "two hundred twenty-five million, seven hundred eighty-seven thousand, six hundred ninety-one".