99987651 has 12 divisors (see below), whose sum is σ = 146583112. Its totient is φ = 65663136.

The previous prime is 99987619. The next prime is 99987683. The reversal of 99987651 is 15678999.

It is an interprime number because it is at equal distance from previous prime (99987619) and next prime (99987683).

It is not a de Polignac number, because 99987651 - 2⁵ = 99987619 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99987611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82306 + ... + 83511.

Almost surely, 2^99987651 is an apocalyptic number.

99987651 is a deficient number, since it is larger than the sum of its proper divisors (46595461).

99987651 is a wasteful number, since it uses less digits than its factorization.

99987651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165890 (or 165887 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 99987651 is about 9999.3825309366. The cubic root of 99987651 is about 464.1397762479.

The spelling of 99987651 in words is "ninety-nine million, nine hundred eighty-seven thousand, six hundred fifty-one".