91142078 has 4 divisors (see below), whose sum is σ = 136713120. Its totient is φ = 45571038.

The previous prime is 91142059. The next prime is 91142081. The reversal of 91142078 is 87024119.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 22785518 + ... + 22785521.

It is an arithmetic number, because the mean of its divisors is an integer number (34178280).

Almost surely, 2^91142078 is an apocalyptic number.

91142078 is a deficient number, since it is larger than the sum of its proper divisors (45571042).

91142078 is a wasteful number, since it uses less digits than its factorization.

91142078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45571041.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 91142078 is about 9546.8360203787. The cubic root of 91142078 is about 450.0281101782.

The spelling of 91142078 in words is "ninety-one million, one hundred forty-two thousand, seventy-eight".