5291051991 has 8 divisors (see below), whose sum is σ = 7056059520. Its totient is φ = 3526706232.

The previous prime is 5291051959. The next prime is 5291051993. The reversal of 5291051991 is 1991501925.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5291051991 - 2⁵ = 5291051959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5291051993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146475 + ... + 178988.

It is an arithmetic number, because the mean of its divisors is an integer number (882007440).

Almost surely, 2^5291051991 is an apocalyptic number.

5291051991 is a deficient number, since it is larger than the sum of its proper divisors (1765007529).

5291051991 is a wasteful number, since it uses less digits than its factorization.

5291051991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330885.

The product of its (nonzero) digits is 36450, while the sum is 42.

The square root of 5291051991 is about 72739.6177540135. The cubic root of 5291051991 is about 1742.5316552540.

The spelling of 5291051991 in words is "five billion, two hundred ninety-one million, fifty-one thousand, nine hundred ninety-one".