4020031231 has 4 divisors (see below), whose sum is σ = 4022032264. Its totient is φ = 4018030200.

The previous prime is 4020031217. The next prime is 4020031277. The reversal of 4020031231 is 1321300204.

It is a happy number.

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 4020031231 - 2⁹ = 4020030719 is a prime.

It is a super-2 number, since 2×4020031231² = 32321302196430750722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020031201) 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, 997500 + ... + 1001521.

It is an arithmetic number, because the mean of its divisors is an integer number (1005508066).

Almost surely, 2^4020031231 is an apocalyptic number.

4020031231 is a deficient number, since it is larger than the sum of its proper divisors (2001033).

4020031231 is a wasteful number, since it uses less digits than its factorization.

4020031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001032.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 4020031231 is about 63403.7162238934. The cubic root of 4020031231 is about 1590.0464407674.

Adding to 4020031231 its reverse (1321300204), we get a palindrome (5341331435).

The spelling of 4020031231 in words is "four billion, twenty million, thirty-one thousand, two hundred thirty-one".