291998113 has 4 divisors (see below), whose sum is σ = 318543408. Its totient is φ = 265452820.

The previous prime is 291998093. The next prime is 291998159. The reversal of 291998113 is 311899192.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 291998113 - 2¹³ = 291989921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 291998113.

It is not an unprimeable number, because it can be changed into a prime (291998173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13272631 + ... + 13272652.

It is an arithmetic number, because the mean of its divisors is an integer number (79635852).

Almost surely, 2^291998113 is an apocalyptic number.

It is an amenable number.

291998113 is a deficient number, since it is larger than the sum of its proper divisors (26545295).

291998113 is a wasteful number, since it uses less digits than its factorization.

291998113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26545294.

The product of its digits is 34992, while the sum is 43.

The square root of 291998113 is about 17087.9522763847. The cubic root of 291998113 is about 663.4273145855.

The spelling of 291998113 in words is "two hundred ninety-one million, nine hundred ninety-eight thousand, one hundred thirteen".