291201091 has 4 divisors (see below), whose sum is σ = 303862032. Its totient is φ = 278540152.

The previous prime is 291201089. The next prime is 291201103. The reversal of 291201091 is 190102192.

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

It is a cyclic number.

It is not a de Polignac number, because 291201091 - 2¹ = 291201089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291204091) 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, 6330436 + ... + 6330481.

It is an arithmetic number, because the mean of its divisors is an integer number (75965508).

Almost surely, 2^291201091 is an apocalyptic number.

291201091 is a deficient number, since it is larger than the sum of its proper divisors (12660941).

291201091 is a wasteful number, since it uses less digits than its factorization.

291201091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12660940.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 291201091 is about 17064.6151729244. The cubic root of 291201091 is about 662.8231463055.

The spelling of 291201091 in words is "two hundred ninety-one million, two hundred one thousand, ninety-one".