1900000901 has 2 divisors, whose sum is σ = 1900000902. Its totient is φ = 1900000900.

The previous prime is 1900000877. The next prime is 1900000919. The reversal of 1900000901 is 1090000091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1376781025 + 523219876 = 37105^2 + 22874^2 .

It is a cyclic number.

It is not a de Polignac number, because 1900000901 - 2¹⁰ = 1899999877 is a prime.

It is a super-2 number, since 2×1900000901² = 7220006847601623602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1900000981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950000450 + 950000451.

It is an arithmetic number, because the mean of its divisors is an integer number (950000451).

Almost surely, 2^1900000901 is an apocalyptic number.

It is an amenable number.

1900000901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1900000901 is an equidigital number, since it uses as much as digits as its factorization.

1900000901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 1900000901 is about 43588.9997705843. Note that the first 3 decimals coincide. The cubic root of 1900000901 is about 1238.5625254099.

Adding to 1900000901 its sum of digits (20), we get a square (1900000921 = 43589²).

Adding to 1900000901 its reverse (1090000091), we get a palindrome (2990000992).

It can be divided in two parts, 190000090 and 1, that added together give a palindrome (190000091).

The spelling of 1900000901 in words is "one billion, nine hundred million, nine hundred one", and thus it is an aban number.