4001020531 has 2 divisors, whose sum is σ = 4001020532. Its totient is φ = 4001020530.

The previous prime is 4001020523. The next prime is 4001020537. The reversal of 4001020531 is 1350201004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4001020531 - 2³ = 4001020523 is a prime.

It is a super-2 number, since 2×4001020531² = 32016330578967043922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4001020537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000510265 + 2000510266.

It is an arithmetic number, because the mean of its divisors is an integer number (2000510266).

Almost surely, 2^4001020531 is an apocalyptic number.

4001020531 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001020531 is an equidigital number, since it uses as much as digits as its factorization.

4001020531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 4001020531 is about 63253.6206947871. The cubic root of 4001020531 is about 1587.5360398208.

Adding to 4001020531 its reverse (1350201004), we get a palindrome (5351221535).

The spelling of 4001020531 in words is "four billion, one million, twenty thousand, five hundred thirty-one".