91951078 has 8 divisors (see below), whose sum is σ = 140529168. Its totient is φ = 45108024.

The previous prime is 91951073. The next prime is 91951091. The reversal of 91951078 is 87015919.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 91951078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91951073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433626 + ... + 433837.

It is an arithmetic number, because the mean of its divisors is an integer number (17566146).

Almost surely, 2^91951078 is an apocalyptic number.

91951078 is a deficient number, since it is larger than the sum of its proper divisors (48578090).

91951078 is a wasteful number, since it uses less digits than its factorization.

91951078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867518.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 91951078 is about 9589.1124719653. The cubic root of 91951078 is about 451.3557107384.

The spelling of 91951078 in words is "ninety-one million, nine hundred fifty-one thousand, seventy-eight".