99991712 has 12 divisors (see below), whose sum is σ = 196858746. Its totient is φ = 49995840.

The previous prime is 99991687. The next prime is 99991721. The reversal of 99991712 is 21719999.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 97693456 + 2298256 = 9884^2 + 1516^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1562339 + ... + 1562402.

Almost surely, 2^99991712 is an apocalyptic number.

It is an amenable number.

99991712 is a deficient number, since it is larger than the sum of its proper divisors (96867034).

99991712 is a wasteful number, since it uses less digits than its factorization.

99991712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124751 (or 3124743 counting only the distinct ones).

The product of its digits is 91854, while the sum is 47.

The square root of 99991712 is about 9999.5855914133. The cubic root of 99991712 is about 464.1460598442.

It can be divided in two parts, 9999 and 1712, that added together give a palindrome (11711).

The spelling of 99991712 in words is "ninety-nine million, nine hundred ninety-one thousand, seven hundred twelve".