91001903 has 2 divisors, whose sum is σ = 91001904. Its totient is φ = 91001902.

The previous prime is 91001891. The next prime is 91001927. The reversal of 91001903 is 30910019.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91001903 - 2¹⁶ = 90936367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91001993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500951 + 45500952.

It is an arithmetic number, because the mean of its divisors is an integer number (45500952).

Almost surely, 2^91001903 is an apocalyptic number.

91001903 is a deficient number, since it is larger than the sum of its proper divisors (1).

91001903 is an equidigital number, since it uses as much as digits as its factorization.

91001903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 91001903 is about 9539.4917579502. The cubic root of 91001903 is about 449.7972798839.

The spelling of 91001903 in words is "ninety-one million, one thousand, nine hundred three".