227650991 has 4 divisors (see below), whose sum is σ = 229179000. Its totient is φ = 226122984.

The previous prime is 227650937. The next prime is 227651023. The reversal of 227650991 is 199056722.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-227650991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (227650931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763781 + ... + 764078.

It is an arithmetic number, because the mean of its divisors is an integer number (57294750).

Almost surely, 2^227650991 is an apocalyptic number.

227650991 is a deficient number, since it is larger than the sum of its proper divisors (1528009).

227650991 is a wasteful number, since it uses less digits than its factorization.

227650991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528008.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 227650991 is about 15088.1076016842. The cubic root of 227650991 is about 610.5995994480.

The spelling of 227650991 in words is "two hundred twenty-seven million, six hundred fifty thousand, nine hundred ninety-one".