4131971991 has 18 divisors (see below), whose sum is σ = 6942838032. Its totient is φ = 2361126600.

The previous prime is 4131971983. The next prime is 4131971993. The reversal of 4131971991 is 1991791314.

It is not a de Polignac number, because 4131971991 - 2³ = 4131971983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4131971993) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4684335 + ... + 4685216.

It is an arithmetic number, because the mean of its divisors is an integer number (385713224).

Almost surely, 2^4131971991 is an apocalyptic number.

4131971991 is a deficient number, since it is larger than the sum of its proper divisors (2810866041).

4131971991 is a wasteful number, since it uses less digits than its factorization.

4131971991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9369571 (or 9369561 counting only the distinct ones).

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

The square root of 4131971991 is about 64280.4168545911. The cubic root of 4131971991 is about 1604.6702079552.

The spelling of 4131971991 in words is "four billion, one hundred thirty-one million, nine hundred seventy-one thousand, nine hundred ninety-one".