1006421531 has 4 divisors (see below), whose sum is σ = 1009164192. Its totient is φ = 1003678872.

The previous prime is 1006421519. The next prime is 1006421569. The reversal of 1006421531 is 1351246001.

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 1006421531 - 2¹⁸ = 1006159387 is a prime.

It is a super-2 number, since 2×1006421531² = 2025768596120767922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1006421497 and 1006421506.

It is not an unprimeable number, because it can be changed into a prime (1006420531) 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 3 ways as a sum of consecutive naturals, for example, 1370780 + ... + 1371513.

It is an arithmetic number, because the mean of its divisors is an integer number (252291048).

Almost surely, 2^1006421531 is an apocalyptic number.

1006421531 is a deficient number, since it is larger than the sum of its proper divisors (2742661).

1006421531 is an equidigital number, since it uses as much as digits as its factorization.

1006421531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742660.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1006421531 is about 31724.1474432332. The cubic root of 1006421531 is about 1002.1359448248.

Adding to 1006421531 its reverse (1351246001), we get a palindrome (2357667532).

The spelling of 1006421531 in words is "one billion, six million, four hundred twenty-one thousand, five hundred thirty-one".