4000431091 has 2 divisors, whose sum is σ = 4000431092. Its totient is φ = 4000431090.

The previous prime is 4000431089. The next prime is 4000431173. The reversal of 4000431091 is 1901340004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4000431091 - 2¹ = 4000431089 is a prime.

Together with 4000431089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4000431011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000215545 + 2000215546.

It is an arithmetic number, because the mean of its divisors is an integer number (2000215546).

Almost surely, 2^4000431091 is an apocalyptic number.

4000431091 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000431091 is an equidigital number, since it uses as much as digits as its factorization.

4000431091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 4000431091 is about 63248.9611851452. The cubic root of 4000431091 is about 1587.4580761119.

Adding to 4000431091 its reverse (1901340004), we get a palindrome (5901771095).

The spelling of 4000431091 in words is "four billion, four hundred thirty-one thousand, ninety-one".