91431194 has 4 divisors (see below), whose sum is σ = 137146794. Its totient is φ = 45715596.

The previous prime is 91431167. The next prime is 91431199. The reversal of 91431194 is 49113419.

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., 90003169 + 1428025 = 9487^2 + 1195^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91431194.

It is not an unprimeable number, because it can be changed into a prime (91431199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22857797 + ... + 22857800.

Almost surely, 2^91431194 is an apocalyptic number.

91431194 is a deficient number, since it is larger than the sum of its proper divisors (45715600).

91431194 is a wasteful number, since it uses less digits than its factorization.

91431194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45715599.

The product of its digits is 3888, while the sum is 32.

The square root of 91431194 is about 9561.9660112343. The cubic root of 91431194 is about 450.5034595651.

The spelling of 91431194 in words is "ninety-one million, four hundred thirty-one thousand, one hundred ninety-four".