91426640919 has 4 divisors (see below), whose sum is σ = 121902187896. Its totient is φ = 60951093944.

The previous prime is 91426640909. The next prime is 91426640927. The reversal of 91426640919 is 91904662419.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91426640919 - 2¹⁵ = 91426608151 is a prime.

It is a super-2 number, since 2×91426640919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91426640909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15237773484 + ... + 15237773489.

It is an arithmetic number, because the mean of its divisors is an integer number (30475546974).

Almost surely, 2^91426640919 is an apocalyptic number.

91426640919 is a deficient number, since it is larger than the sum of its proper divisors (30475546977).

91426640919 is a wasteful number, since it uses less digits than its factorization.

91426640919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30475546976.

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 91426640919 in words is "ninety-one billion, four hundred twenty-six million, six hundred forty thousand, nine hundred nineteen".