91178917054 has 8 divisors (see below), whose sum is σ = 136803393288. Its totient is φ = 45577785960.

The previous prime is 91178917051. The next prime is 91178917103. The reversal of 91178917054 is 45071987119.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 91178916992 and 91178917010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91178917051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5826517 + ... + 5842144.

It is an arithmetic number, because the mean of its divisors is an integer number (17100424161).

Almost surely, 2^91178917054 is an apocalyptic number.

91178917054 is a deficient number, since it is larger than the sum of its proper divisors (45624476234).

91178917054 is a wasteful number, since it uses less digits than its factorization.

91178917054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11672570.

The product of its (nonzero) digits is 635040, while the sum is 52.

The spelling of 91178917054 in words is "ninety-one billion, one hundred seventy-eight million, nine hundred seventeen thousand, fifty-four".