5450631991 has 4 divisors (see below), whose sum is σ = 6229293712. Its totient is φ = 4671970272.

The previous prime is 5450631961. The next prime is 5450631997. The reversal of 5450631991 is 1991360545.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5450631991 - 2⁵ = 5450631959 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 (5450631997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389330850 + ... + 389330863.

It is an arithmetic number, because the mean of its divisors is an integer number (1557323428).

Almost surely, 2^5450631991 is an apocalyptic number.

5450631991 is a deficient number, since it is larger than the sum of its proper divisors (778661721).

5450631991 is an equidigital number, since it uses as much as digits as its factorization.

5450631991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778661720.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 5450631991 is about 73828.3955602450. The cubic root of 5450631991 is about 1759.8768843589.

The spelling of 5450631991 in words is "five billion, four hundred fifty million, six hundred thirty-one thousand, nine hundred ninety-one".