291020093 has 32 divisors (see below), whose sum is σ = 399248640. Its totient is φ = 205286400.

The previous prime is 291020069. The next prime is 291020101. The reversal of 291020093 is 390020192.

It is a cyclic number.

It is not a de Polignac number, because 291020093 - 2¹² = 291015997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291020003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24443 + ... + 34343.

It is an arithmetic number, because the mean of its divisors is an integer number (12476520).

Almost surely, 2^291020093 is an apocalyptic number.

It is an amenable number.

291020093 is a deficient number, since it is larger than the sum of its proper divisors (108228547).

291020093 is a wasteful number, since it uses less digits than its factorization.

291020093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9957.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 291020093 is about 17059.3110353261. The cubic root of 291020093 is about 662.6857904460.

Subtracting 291020093 from its reverse (390020192), we obtain a palindrome (99000099).

The spelling of 291020093 in words is "two hundred ninety-one million, twenty thousand, ninety-three".