291121093 has 8 divisors (see below), whose sum is σ = 300836096. Its totient is φ = 281426400.

The previous prime is 291121081. The next prime is 291121123. The reversal of 291121093 is 390121192.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291121093 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 (291121043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27478 + ... + 36568.

It is an arithmetic number, because the mean of its divisors is an integer number (37604512).

Almost surely, 2^291121093 is an apocalyptic number.

It is an amenable number.

291121093 is a deficient number, since it is larger than the sum of its proper divisors (9715003).

291121093 is a wasteful number, since it uses less digits than its factorization.

291121093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10155.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 291121093 is about 17062.2710387568. The cubic root of 291121093 is about 662.7624444011.

Subtracting 291121093 from its reverse (390121192), we obtain a palindrome (99000099).

The spelling of 291121093 in words is "two hundred ninety-one million, one hundred twenty-one thousand, ninety-three".