684171099 has 6 divisors (see below), whose sum is σ = 988247156. Its totient is φ = 456114060.

The previous prime is 684171097. The next prime is 684171121. The reversal of 684171099 is 990171486.

It is a happy number.

It is not a de Polignac number, because 684171099 - 2¹ = 684171097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684171097) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38009497 + ... + 38009514.

Almost surely, 2^684171099 is an apocalyptic number.

684171099 is a deficient number, since it is larger than the sum of its proper divisors (304076057).

684171099 is a wasteful number, since it uses less digits than its factorization.

684171099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76019017 (or 76019014 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 684171099 is about 26156.6645235970. The cubic root of 684171099 is about 881.1602717757.

The spelling of 684171099 in words is "six hundred eighty-four million, one hundred seventy-one thousand, ninety-nine".