209061987 has 8 divisors (see below), whose sum is σ = 278823936. Its totient is φ = 139337352.

The previous prime is 209061967. The next prime is 209061989. The reversal of 209061987 is 789160902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 209061987 - 2⁷ = 209061859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209061989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8758 + ... + 22244.

It is an arithmetic number, because the mean of its divisors is an integer number (34852992).

Almost surely, 2^209061987 is an apocalyptic number.

209061987 is a deficient number, since it is larger than the sum of its proper divisors (69761949).

209061987 is a wasteful number, since it uses less digits than its factorization.

209061987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18657.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 209061987 is about 14458.9760010867. The cubic root of 209061987 is about 593.5058781170.

The spelling of 209061987 in words is "two hundred nine million, sixty-one thousand, nine hundred eighty-seven".