102991818 has 32 divisors (see below), whose sum is σ = 224308800. Its totient is φ = 31401216.

The previous prime is 102991709. The next prime is 102991829. The reversal of 102991818 is 818199201.

It is a Smith number, since the sum of its digits (39) 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12271 + ... + 18882.

It is an arithmetic number, because the mean of its divisors is an integer number (7009650).

Almost surely, 2^102991818 is an apocalyptic number.

102991818 is an abundant number, since it is smaller than the sum of its proper divisors (121316982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102991818 is a wasteful number, since it uses less digits than its factorization.

102991818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31206.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 102991818 is about 10148.4884588790. The cubic root of 102991818 is about 468.7424022946.

The spelling of 102991818 in words is "one hundred two million, nine hundred ninety-one thousand, eight hundred eighteen".