91178491452 has 24 divisors (see below), whose sum is σ = 213329523456. Its totient is φ = 30310014768.

The previous prime is 91178491427. The next prime is 91178491471. The reversal of 91178491452 is 25419487119.

It is a junction number, because it is equal to n+sod(n) for n = 91178491395 and 91178491404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10347378 + ... + 10356185.

It is an arithmetic number, because the mean of its divisors is an integer number (8888730144).

Almost surely, 2^91178491452 is an apocalyptic number.

It is an amenable number.

91178491452 is an abundant number, since it is smaller than the sum of its proper divisors (122151032004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91178491452 is a wasteful number, since it uses less digits than its factorization.

91178491452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20703937 (or 20703935 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

It can be divided in two parts, 911784 and 91452, that added together give a triangular number (1003236 = T₁₄₁₆).

The spelling of 91178491452 in words is "ninety-one billion, one hundred seventy-eight million, four hundred ninety-one thousand, four hundred fifty-two".