987009869 has 4 divisors (see below), whose sum is σ = 987122880. Its totient is φ = 986896860.

The previous prime is 987009857. The next prime is 987009871. The reversal of 987009869 is 968900789.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 968900789 = 191 ⋅5072779.

It is a cyclic number.

It is not a de Polignac number, because 987009869 - 2²⁸ = 718574413 is a prime.

It is a super-2 number, since 2×987009869² = 1948376963006794322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987002869) 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, 42197 + ... + 61274.

It is an arithmetic number, because the mean of its divisors is an integer number (246780720).

Almost surely, 2^987009869 is an apocalyptic number.

It is an amenable number.

987009869 is a deficient number, since it is larger than the sum of its proper divisors (113011).

987009869 is a wasteful number, since it uses less digits than its factorization.

987009869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113010.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 987009869 is about 31416.7132112829. The cubic root of 987009869 is about 995.6510705635.

The spelling of 987009869 in words is "nine hundred eighty-seven million, nine thousand, eight hundred sixty-nine".