1020001901 has 4 divisors (see below), whose sum is σ = 1023606432. Its totient is φ = 1016397372.

The previous prime is 1020001867. The next prime is 1020001919. The reversal of 1020001901 is 1091000201.

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.

It is a cyclic number.

It is not a de Polignac number, because 1020001901 - 2⁶ = 1020001837 is a prime.

It is a super-2 number, since 2×1020001901² = 2080807756087227602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020001951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1801841 + ... + 1802406.

It is an arithmetic number, because the mean of its divisors is an integer number (255901608).

Almost surely, 2^1020001901 is an apocalyptic number.

It is an amenable number.

1020001901 is a deficient number, since it is larger than the sum of its proper divisors (3604531).

1020001901 is an equidigital number, since it uses as much as digits as its factorization.

1020001901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604530.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1020001901 is about 31937.4686066382. The cubic root of 1020001901 is about 1006.6233349159.

The spelling of 1020001901 in words is "one billion, twenty million, one thousand, nine hundred one".