90865047194 has 4 divisors (see below), whose sum is σ = 136297570794. Its totient is φ = 45432523596.

The previous prime is 90865047191. The next prime is 90865047199. The reversal of 90865047194 is 49174056809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49174056809 = 17 ⋅2892591577.

It can be written as a sum of positive squares in only one way, i.e., 58775698969 + 32089348225 = 242437^2 + 179135^2 .

It is not an unprimeable number, because it can be changed into a prime (90865047191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22716261797 + ... + 22716261800.

Almost surely, 2^90865047194 is an apocalyptic number.

90865047194 is a deficient number, since it is larger than the sum of its proper divisors (45432523600).

90865047194 is a wasteful number, since it uses less digits than its factorization.

90865047194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45432523599.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 90865047194 in words is "ninety billion, eight hundred sixty-five million, forty-seven thousand, one hundred ninety-four".