1012020001 has 4 divisors (see below), whose sum is σ = 1031114772. Its totient is φ = 992925232.

The previous prime is 1012019993. The next prime is 1012020019. The reversal of 1012020001 is 1000202101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 912040000 + 99980001 = 30200^2 + 9999^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012020001 - 2³ = 1012019993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012020091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9547306 + ... + 9547411.

It is an arithmetic number, because the mean of its divisors is an integer number (257778693).

Almost surely, 2^1012020001 is an apocalyptic number.

It is an amenable number.

1012020001 is a deficient number, since it is larger than the sum of its proper divisors (19094771).

1012020001 is an equidigital number, since it uses as much as digits as its factorization.

1012020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19094770.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1012020001 is about 31812.2618026446. The cubic root of 1012020001 is about 1003.9907199689.

Adding to 1012020001 its reverse (1000202101), we get a palindrome (2012222102).

The spelling of 1012020001 in words is "one billion, twelve million, twenty thousand, one".