900138894091 has 2 divisors, whose sum is σ = 900138894092. Its totient is φ = 900138894090.

The previous prime is 900138894059. The next prime is 900138894139. The reversal of 900138894091 is 190498831009.

It is a weak prime.

It is an emirp because it is prime and its reverse (190498831009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 900138894091 - 2⁵ = 900138894059 is a prime.

It is not a weakly prime, because it can be changed into another prime (900138894191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450069447045 + 450069447046.

It is an arithmetic number, because the mean of its divisors is an integer number (450069447046).

Almost surely, 2^900138894091 is an apocalyptic number.

900138894091 is a deficient number, since it is larger than the sum of its proper divisors (1).

900138894091 is an equidigital number, since it uses as much as digits as its factorization.

900138894091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 52.

The spelling of 900138894091 in words is "nine hundred billion, one hundred thirty-eight million, eight hundred ninety-four thousand, ninety-one".