4020542531 has 4 divisors (see below), whose sum is σ = 4195348752. Its totient is φ = 3845736312.

The previous prime is 4020542521. The next prime is 4020542569. The reversal of 4020542531 is 1352450204.

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 4020542531 - 2¹⁰ = 4020541507 is a prime.

It is a super-2 number, since 2×4020542531² = 32329524487159771922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4020542531.

It is not an unprimeable number, because it can be changed into a prime (4020542501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87403076 + ... + 87403121.

It is an arithmetic number, because the mean of its divisors is an integer number (1048837188).

Almost surely, 2^4020542531 is an apocalyptic number.

4020542531 is a deficient number, since it is larger than the sum of its proper divisors (174806221).

4020542531 is a wasteful number, since it uses less digits than its factorization.

4020542531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174806220.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 4020542531 is about 63407.7481937342. The cubic root of 4020542531 is about 1590.1138495538.

Adding to 4020542531 its reverse (1352450204), we get a palindrome (5372992735).

The spelling of 4020542531 in words is "four billion, twenty million, five hundred forty-two thousand, five hundred thirty-one".