1431991791 has 20 divisors (see below), whose sum is σ = 2251737400. Its totient is φ = 904414896.

The previous prime is 1431991763. The next prime is 1431991823. The reversal of 1431991791 is 1971991341.

It is not a de Polignac number, because 1431991791 - 2¹⁷ = 1431860719 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 (1431991721) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 463696 + ... + 466773.

It is an arithmetic number, because the mean of its divisors is an integer number (112586870).

Almost surely, 2^1431991791 is an apocalyptic number.

1431991791 is a deficient number, since it is larger than the sum of its proper divisors (819745609).

1431991791 is an equidigital number, since it uses as much as digits as its factorization.

1431991791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930500 (or 930491 counting only the distinct ones).

The product of its digits is 61236, while the sum is 45.

The square root of 1431991791 is about 37841.6673919107. The cubic root of 1431991791 is about 1127.1460050967.

The spelling of 1431991791 in words is "one billion, four hundred thirty-one million, nine hundred ninety-one thousand, seven hundred ninety-one".