1012031521 has 4 divisors (see below), whose sum is σ = 1012139712. Its totient is φ = 1011923332.

The previous prime is 1012031519. The next prime is 1012031567. The reversal of 1012031521 is 1251302101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1012031521 - 2¹ = 1012031519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012031495 and 1012031504.

It is not an unprimeable number, because it can be changed into a prime (1012031021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38581 + ... + 59266.

It is an arithmetic number, because the mean of its divisors is an integer number (253034928).

Almost surely, 2^1012031521 is an apocalyptic number.

It is an amenable number.

1012031521 is a deficient number, since it is larger than the sum of its proper divisors (108191).

1012031521 is an equidigital number, since it uses as much as digits as its factorization.

1012031521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108190.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1012031521 is about 31812.4428643888. The cubic root of 1012031521 is about 1003.9945294882.

Adding to 1012031521 its reverse (1251302101), we get a palindrome (2263333622).

The spelling of 1012031521 in words is "one billion, twelve million, thirty-one thousand, five hundred twenty-one".