9919391901 has 16 divisors (see below), whose sum is σ = 13717815168. Its totient is φ = 6370488000.

The previous prime is 9919391857. The next prime is 9919391927. The reversal of 9919391901 is 1091939199.

It is not a de Polignac number, because 9919391901 - 2⁶ = 9919391837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9919391701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431185 + ... + 453606.

It is an arithmetic number, because the mean of its divisors is an integer number (857363448).

Almost surely, 2^9919391901 is an apocalyptic number.

It is an amenable number.

9919391901 is a deficient number, since it is larger than the sum of its proper divisors (3798423267).

9919391901 is a wasteful number, since it uses less digits than its factorization.

9919391901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884932.

The product of its (nonzero) digits is 177147, while the sum is 51.

The square root of 9919391901 is about 99596.1440066833. The cubic root of 9919391901 is about 2148.6302362892.

The spelling of 9919391901 in words is "nine billion, nine hundred nineteen million, three hundred ninety-one thousand, nine hundred one".