206989499531 has 2 divisors, whose sum is σ = 206989499532. Its totient is φ = 206989499530.

The previous prime is 206989499491. The next prime is 206989499537. The reversal of 206989499531 is 135994989602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206989499531 - 2⁶ = 206989499467 is a prime.

It is a super-2 number, since 2×206989499531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206989499537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103494749765 + 103494749766.

It is an arithmetic number, because the mean of its divisors is an integer number (103494749766).

Almost surely, 2^206989499531 is an apocalyptic number.

206989499531 is a deficient number, since it is larger than the sum of its proper divisors (1).

206989499531 is an equidigital number, since it uses as much as digits as its factorization.

206989499531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37791360, while the sum is 65.

The spelling of 206989499531 in words is "two hundred six billion, nine hundred eighty-nine million, four hundred ninety-nine thousand, five hundred thirty-one".