1900008901 has 4 divisors (see below), whose sum is σ = 2171438752. Its totient is φ = 1628579052.

The previous prime is 1900008883. The next prime is 1900008917. The reversal of 1900008901 is 1098000091.

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 an emirpimes, since its reverse is a distinct semiprime: 1098000091 = 23431 ⋅46861.

It is a cyclic number.

It is not a de Polignac number, because 1900008901 - 2⁹ = 1900008389 is a prime.

It is a super-2 number, since 2×1900008901² = 7220067647758455602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1900008901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900000901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135714915 + ... + 135714928.

It is an arithmetic number, because the mean of its divisors is an integer number (542859688).

Almost surely, 2^1900008901 is an apocalyptic number.

It is an amenable number.

1900008901 is a deficient number, since it is larger than the sum of its proper divisors (271429851).

1900008901 is an equidigital number, since it uses as much as digits as its factorization.

1900008901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271429850.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1900008901 is about 43589.0915367595. The cubic root of 1900008901 is about 1238.5642637400.

Adding to 1900008901 its reverse (1098000091), we get a palindrome (2998008992).

The spelling of 1900008901 in words is "one billion, nine hundred million, eight thousand, nine hundred one".