102991587 has 4 divisors (see below), whose sum is σ = 137322120. Its totient is φ = 68661056.

The previous prime is 102991583. The next prime is 102991597. The reversal of 102991587 is 785199201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 785199201 = 3 ⋅261733067.

It is a cyclic number.

It is not a de Polignac number, because 102991587 - 2² = 102991583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102991583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17165262 + ... + 17165267.

It is an arithmetic number, because the mean of its divisors is an integer number (34330530).

Almost surely, 2^102991587 is an apocalyptic number.

102991587 is a deficient number, since it is larger than the sum of its proper divisors (34330533).

102991587 is an equidigital number, since it uses as much as digits as its factorization.

102991587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34330532.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 102991587 is about 10148.4770778674. The cubic root of 102991587 is about 468.7420518475.

The spelling of 102991587 in words is "one hundred two million, nine hundred ninety-one thousand, five hundred eighty-seven".