99991256 has 8 divisors (see below), whose sum is σ = 187483620. Its totient is φ = 49995624.

The previous prime is 99991249. The next prime is 99991271. The reversal of 99991256 is 65219999.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6249446 + ... + 6249461.

Almost surely, 2^99991256 is an apocalyptic number.

It is an amenable number.

99991256 is a deficient number, since it is larger than the sum of its proper divisors (87492364).

99991256 is a wasteful number, since it uses less digits than its factorization.

99991256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12498913 (or 12498909 counting only the distinct ones).

The product of its digits is 393660, while the sum is 50.

The square root of 99991256 is about 9999.5627904424. The cubic root of 99991256 is about 464.1453542827.

The spelling of 99991256 in words is "ninety-nine million, nine hundred ninety-one thousand, two hundred fifty-six".