206987311 has 8 divisors (see below), whose sum is σ = 223196400. Its totient is φ = 191309760.

The previous prime is 206987299. The next prime is 206987323. The reversal of 206987311 is 113789602.

It is an interprime number because it is at equal distance from previous prime (206987299) and next prime (206987323).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206987311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206987351) 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 7 ways as a sum of consecutive naturals, for example, 132076 + ... + 133633.

It is an arithmetic number, because the mean of its divisors is an integer number (27899550).

Almost surely, 2^206987311 is an apocalyptic number.

206987311 is a deficient number, since it is larger than the sum of its proper divisors (16209089).

206987311 is a wasteful number, since it uses less digits than its factorization.

206987311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265769.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 206987311 is about 14387.0535899468. The cubic root of 206987311 is about 591.5360825174.

The spelling of 206987311 in words is "two hundred six million, nine hundred eighty-seven thousand, three hundred eleven".