206744431 has 2 divisors, whose sum is σ = 206744432. Its totient is φ = 206744430.

The previous prime is 206744423. The next prime is 206744449. The reversal of 206744431 is 134447602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206744431 - 2³ = 206744423 is a prime.

It is a super-2 number, since 2×206744431² = 85486519499027522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 206744393 and 206744402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206744471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103372215 + 103372216.

It is an arithmetic number, because the mean of its divisors is an integer number (103372216).

Almost surely, 2^206744431 is an apocalyptic number.

206744431 is a deficient number, since it is larger than the sum of its proper divisors (1).

206744431 is an equidigital number, since it uses as much as digits as its factorization.

206744431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 206744431 is about 14378.6101901401. The cubic root of 206744431 is about 591.3046214438.

The spelling of 206744431 in words is "two hundred six million, seven hundred forty-four thousand, four hundred thirty-one".