91351994 has 4 divisors (see below), whose sum is σ = 137027994. Its totient is φ = 45675996.

The previous prime is 91351987. The next prime is 91352017. The reversal of 91351994 is 49915319.

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

It can be written as a sum of positive squares in only one way, i.e., 54567769 + 36784225 = 7387^2 + 6065^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 22837997 + ... + 22838000.

Almost surely, 2^91351994 is an apocalyptic number.

91351994 is a deficient number, since it is larger than the sum of its proper divisors (45676000).

91351994 is a wasteful number, since it uses less digits than its factorization.

91351994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45675999.

The product of its digits is 43740, while the sum is 41.

The square root of 91351994 is about 9557.8237062628. The cubic root of 91351994 is about 450.3733428451.

The spelling of 91351994 in words is "ninety-one million, three hundred fifty-one thousand, nine hundred ninety-four".