291490983 has 24 divisors (see below), whose sum is σ = 502115328. Its totient is φ = 159323472.

The previous prime is 291490981. The next prime is 291490999. The reversal of 291490983 is 389094192.

It is not a de Polignac number, because 291490983 - 2¹ = 291490981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291490981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99135 + ... + 102032.

It is an arithmetic number, because the mean of its divisors is an integer number (20921472).

Almost surely, 2^291490983 is an apocalyptic number.

291490983 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

291490983 is a deficient number, since it is larger than the sum of its proper divisors (210624345).

291490983 is a wasteful number, since it uses less digits than its factorization.

291490983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201203 (or 201200 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 291490983 is about 17073.1070107347. The cubic root of 291490983 is about 663.0430211705.

The spelling of 291490983 in words is "two hundred ninety-one million, four hundred ninety thousand, nine hundred eighty-three".