206270731 has 4 divisors (see below), whose sum is σ = 206422992. Its totient is φ = 206118472.

The previous prime is 206270711. The next prime is 206270737. The reversal of 206270731 is 137072602.

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 206270731 - 2¹¹ = 206268683 is a prime.

It is a super-2 number, since 2×206270731² = 85095228934548722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206270731.

It is not an unprimeable number, because it can be changed into a prime (206270737) 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, 74080 + ... + 76813.

It is an arithmetic number, because the mean of its divisors is an integer number (51605748).

Almost surely, 2^206270731 is an apocalyptic number.

206270731 is a deficient number, since it is larger than the sum of its proper divisors (152261).

206270731 is a wasteful number, since it uses less digits than its factorization.

206270731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152260.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 206270731 is about 14362.1283589864. The cubic root of 206270731 is about 590.8526702171.

The spelling of 206270731 in words is "two hundred six million, two hundred seventy thousand, seven hundred thirty-one".