227491091 has 4 divisors (see below), whose sum is σ = 237382032. Its totient is φ = 217600152.

The previous prime is 227491081. The next prime is 227491151. The reversal of 227491091 is 190194722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190194722 = 2 ⋅95097361.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-227491091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (227491081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4945436 + ... + 4945481.

It is an arithmetic number, because the mean of its divisors is an integer number (59345508).

Almost surely, 2^227491091 is an apocalyptic number.

227491091 is a deficient number, since it is larger than the sum of its proper divisors (9890941).

227491091 is an equidigital number, since it uses as much as digits as its factorization.

227491091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9890940.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 227491091 is about 15082.8077956327. The cubic root of 227491091 is about 610.4566060823.

The spelling of 227491091 in words is "two hundred twenty-seven million, four hundred ninety-one thousand, ninety-one".