919491418909 has 4 divisors (see below), whose sum is σ = 1050847335904. Its totient is φ = 788135501916.

The previous prime is 919491418897. The next prime is 919491418949. The reversal of 919491418909 is 909814194919.

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.

It is not a de Polignac number, because 919491418909 - 2⁵ = 919491418877 is a prime.

It is a super-2 number, since 2×919491418909² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919491418949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65677958487 + ... + 65677958500.

It is an arithmetic number, because the mean of its divisors is an integer number (262711833976).

Almost surely, 2^919491418909 is an apocalyptic number.

It is an amenable number.

919491418909 is a deficient number, since it is larger than the sum of its proper divisors (131355916995).

919491418909 is a wasteful number, since it uses less digits than its factorization.

919491418909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131355916994.

The product of its (nonzero) digits is 7558272, while the sum is 64.

The spelling of 919491418909 in words is "nine hundred nineteen billion, four hundred ninety-one million, four hundred eighteen thousand, nine hundred nine".