3991431485 has 8 divisors (see below), whose sum is σ = 4790072376. Its totient is φ = 3192908800.

The previous prime is 3991431473. The next prime is 3991431487. The reversal of 3991431485 is 5841341993.

It can be written as a sum of positive squares in 4 ways, for example, as 374732164 + 3616699321 = 19358^2 + 60139^2 .

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

It is not a de Polignac number, because 3991431485 - 2⁶ = 3991431421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991431487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85385 + ... + 123585.

It is an arithmetic number, because the mean of its divisors is an integer number (598759047).

Almost surely, 2^3991431485 is an apocalyptic number.

It is an amenable number.

3991431485 is a deficient number, since it is larger than the sum of its proper divisors (798640891).

3991431485 is a wasteful number, since it uses less digits than its factorization.

3991431485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59103.

The product of its digits is 466560, while the sum is 47.

The square root of 3991431485 is about 63177.7768285653. The cubic root of 3991431485 is about 1586.2667691786.

The spelling of 3991431485 in words is "three billion, nine hundred ninety-one million, four hundred thirty-one thousand, four hundred eighty-five".