99951587 has 4 divisors (see below), whose sum is σ = 101837520. Its totient is φ = 98065656.

The previous prime is 99951569. The next prime is 99951601. The reversal of 99951587 is 78515999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78515999 = 19 ⋅4132421.

It is a cyclic number.

It is not a de Polignac number, because 99951587 - 2⁸ = 99951331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1885879 = 99951587 / (9 + 9 + 9 + 5 + 1 + 5 + 8 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99951557) 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, 942887 + ... + 942992.

It is an arithmetic number, because the mean of its divisors is an integer number (25459380).

Almost surely, 2^99951587 is an apocalyptic number.

99951587 is a deficient number, since it is larger than the sum of its proper divisors (1885933).

99951587 is a wasteful number, since it uses less digits than its factorization.

99951587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885932.

The product of its digits is 1020600, while the sum is 53.

The square root of 99951587 is about 9997.5790569517. The cubic root of 99951587 is about 464.0839668568.

The spelling of 99951587 in words is "ninety-nine million, nine hundred fifty-one thousand, five hundred eighty-seven".