99781834 has 4 divisors (see below), whose sum is σ = 149672754. Its totient is φ = 49890916.

The previous prime is 99781817. The next prime is 99781849. The reversal of 99781834 is 43818799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43818799 = 487 ⋅89977.

It can be written as a sum of positive squares in only one way, i.e., 58140625 + 41641209 = 7625^2 + 6453^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24945457 + ... + 24945460.

Almost surely, 2^99781834 is an apocalyptic number.

99781834 is a deficient number, since it is larger than the sum of its proper divisors (49890920).

99781834 is a wasteful number, since it uses less digits than its factorization.

99781834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49890919.

The product of its digits is 435456, while the sum is 49.

The square root of 99781834 is about 9989.0857439507. The cubic root of 99781834 is about 463.8210919702.

The spelling of 99781834 in words is "ninety-nine million, seven hundred eighty-one thousand, eight hundred thirty-four".