291284991 has 40 divisors (see below), whose sum is σ = 467892480. Its totient is φ = 180010512.

The previous prime is 291284971. The next prime is 291284993. The reversal of 291284991 is 199482192.

It is not a de Polignac number, because 291284991 - 2²¹ = 289187839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291284993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70320 + ... + 74346.

It is an arithmetic number, because the mean of its divisors is an integer number (11697312).

Almost surely, 2^291284991 is an apocalyptic number.

291284991 is a deficient number, since it is larger than the sum of its proper divisors (176607489).

291284991 is a wasteful number, since it uses less digits than its factorization.

291284991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105 (or 4096 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 291284991 is about 17067.0732991922. The cubic root of 291284991 is about 662.8867970767.

The spelling of 291284991 in words is "two hundred ninety-one million, two hundred eighty-four thousand, nine hundred ninety-one".