1012005531 has 12 divisors (see below), whose sum is σ = 1538722120. Its totient is φ = 639161280.

The previous prime is 1012005521. The next prime is 1012005541. The reversal of 1012005531 is 1355002101.

1012005531 is a `hidden beast` number, since 10 + 120 + 0 + 5 + 531 = 666.

It is an interprime number because it is at equal distance from previous prime (1012005521) and next prime (1012005541).

It is not a de Polignac number, because 1012005531 - 2⁵ = 1012005499 is a prime.

It is a super-2 number, since 2×1012005531² = 2048310389549183922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012005521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2958910 + ... + 2959251.

Almost surely, 2^1012005531 is an apocalyptic number.

1012005531 is a deficient number, since it is larger than the sum of its proper divisors (526716589).

1012005531 is a wasteful number, since it uses less digits than its factorization.

1012005531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5918186 (or 5918183 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 1012005531 is about 31812.0343738026. The cubic root of 1012005531 is about 1003.9859348807.

Adding to 1012005531 its reverse (1355002101), we get a palindrome (2367007632).

The spelling of 1012005531 in words is "one billion, twelve million, five thousand, five hundred thirty-one".