206907431 has 4 divisors (see below), whose sum is σ = 214042200. Its totient is φ = 199772664.

The previous prime is 206907427. The next prime is 206907433. The reversal of 206907431 is 134709602.

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 206907431 - 2² = 206907427 is a prime.

It is a super-2 number, since 2×206907431² = 85621370006039522, 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 (206907433) 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, 3567341 + ... + 3567398.

It is an arithmetic number, because the mean of its divisors is an integer number (53510550).

Almost surely, 2^206907431 is an apocalyptic number.

206907431 is a deficient number, since it is larger than the sum of its proper divisors (7134769).

206907431 is an equidigital number, since it uses as much as digits as its factorization.

206907431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134768.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 206907431 is about 14384.2772150706. The cubic root of 206907431 is about 591.4599780422.

The spelling of 206907431 in words is "two hundred six million, nine hundred seven thousand, four hundred thirty-one".