10019090891 has 2 divisors, whose sum is σ = 10019090892. Its totient is φ = 10019090890.

The previous prime is 10019090867. The next prime is 10019090923. The reversal of 10019090891 is 19809091001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10019090891 - 2⁶ = 10019090827 is a prime.

It is not a weakly prime, because it can be changed into another prime (10019090791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5009545445 + 5009545446.

It is an arithmetic number, because the mean of its divisors is an integer number (5009545446).

Almost surely, 2^10019090891 is an apocalyptic number.

10019090891 is a deficient number, since it is larger than the sum of its proper divisors (1).

10019090891 is an equidigital number, since it uses as much as digits as its factorization.

10019090891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 10019090891 in words is "ten billion, nineteen million, ninety thousand, eight hundred ninety-one".