206451641 has 4 divisors (see below), whose sum is σ = 225219984. Its totient is φ = 187683300.

The previous prime is 206451631. The next prime is 206451653. The reversal of 206451641 is 146154602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206451641 - 2⁶ = 206451577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206451631) 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, 9384155 + ... + 9384176.

It is an arithmetic number, because the mean of its divisors is an integer number (56304996).

Almost surely, 2^206451641 is an apocalyptic number.

It is an amenable number.

206451641 is a deficient number, since it is larger than the sum of its proper divisors (18768343).

206451641 is a wasteful number, since it uses less digits than its factorization.

206451641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18768342.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 206451641 is about 14368.4251398683. The cubic root of 206451641 is about 591.0253557643.

The spelling of 206451641 in words is "two hundred six million, four hundred fifty-one thousand, six hundred forty-one".