99142787 has 4 divisors (see below), whose sum is σ = 101252256. Its totient is φ = 97033320.

The previous prime is 99142777. The next prime is 99142789. The reversal of 99142787 is 78724199.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99142787 - 2⁸ = 99142531 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 2109421 = 99142787 / (9 + 9 + 1 + 4 + 2 + 7 + 8 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99142789) 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, 1054664 + ... + 1054757.

It is an arithmetic number, because the mean of its divisors is an integer number (25313064).

Almost surely, 2^99142787 is an apocalyptic number.

99142787 is a deficient number, since it is larger than the sum of its proper divisors (2109469).

99142787 is a wasteful number, since it uses less digits than its factorization.

99142787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109468.

The product of its digits is 254016, while the sum is 47.

The square root of 99142787 is about 9957.0471024295. The cubic root of 99142787 is about 462.8287987747.

The spelling of 99142787 in words is "ninety-nine million, one hundred forty-two thousand, seven hundred eighty-seven".