1999100102 has 4 divisors (see below), whose sum is σ = 2998650156. Its totient is φ = 999550050.

The previous prime is 1999100101. The next prime is 1999100107. The reversal of 1999100102 is 2010019991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2010019991 = 7 ⋅287145713.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999100101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499775024 + ... + 499775027.

It is an arithmetic number, because the mean of its divisors is an integer number (749662539).

Almost surely, 2^1999100102 is an apocalyptic number.

1999100102 is a deficient number, since it is larger than the sum of its proper divisors (999550054).

1999100102 is an equidigital number, since it uses as much as digits as its factorization.

1999100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999550053.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 1999100102 is about 44711.2972524842. The cubic root of 1999100102 is about 1259.7320548072.

The spelling of 1999100102 in words is "one billion, nine hundred ninety-nine million, one hundred thousand, one hundred two".