537291991 has 4 divisors (see below), whose sum is σ = 537353752. Its totient is φ = 537230232.

The previous prime is 537291967. The next prime is 537292001. The reversal of 537291991 is 199192735.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 537291991 - 2⁵ = 537291959 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 (537291901) 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, 15165 + ... + 36118.

It is an arithmetic number, because the mean of its divisors is an integer number (134338438).

Almost surely, 2^537291991 is an apocalyptic number.

537291991 is a deficient number, since it is larger than the sum of its proper divisors (61761).

537291991 is a wasteful number, since it uses less digits than its factorization.

537291991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61760.

The product of its digits is 153090, while the sum is 46.

The square root of 537291991 is about 23179.5597671742. The cubic root of 537291991 is about 812.9617684718.

The spelling of 537291991 in words is "five hundred thirty-seven million, two hundred ninety-one thousand, nine hundred ninety-one".