99999649 has 4 divisors (see below), whose sum is σ = 100064560. Its totient is φ = 99934740.

The previous prime is 99999643. The next prime is 99999677. The reversal of 99999649 is 94699999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99999649 - 2⁵ = 99999617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30087 + ... + 33244.

It is an arithmetic number, because the mean of its divisors is an integer number (25016140).

Almost surely, 2^99999649 is an apocalyptic number.

It is an amenable number.

99999649 is a deficient number, since it is larger than the sum of its proper divisors (64911).

99999649 is a wasteful number, since it uses less digits than its factorization.

99999649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64910.

The product of its digits is 12754584, while the sum is 64.

The square root of 99999649 is about 9999.9824499846. The cubic root of 99999649 is about 464.1583402947.

The spelling of 99999649 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred forty-nine".