99991501 has 16 divisors (see below), whose sum is σ = 110315520. Its totient is φ = 90236160.

The previous prime is 99991499. The next prime is 99991517. The reversal of 99991501 is 10519999.

It is a cyclic number.

It is not a de Polignac number, because 99991501 - 2¹ = 99991499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99991561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43540 + ... + 45778.

It is an arithmetic number, because the mean of its divisors is an integer number (6894720).

Almost surely, 2^99991501 is an apocalyptic number.

It is an amenable number.

99991501 is a deficient number, since it is larger than the sum of its proper divisors (10324019).

99991501 is a wasteful number, since it uses less digits than its factorization.

99991501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364.

The product of its (nonzero) digits is 32805, while the sum is 43.

The square root of 99991501 is about 9999.5750409705. The cubic root of 99991501 is about 464.1457333676.

The spelling of 99991501 in words is "ninety-nine million, nine hundred ninety-one thousand, five hundred one".