205212551 has 8 divisors (see below), whose sum is σ = 208681200. Its totient is φ = 201769920.

The previous prime is 205212541. The next prime is 205212583. The reversal of 205212551 is 155212502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205212551 - 2⁶ = 205212487 is a prime.

It is a super-2 number, since 2×205212551² = 84224382175855202, 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 (205212541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9740 + ... + 22478.

It is an arithmetic number, because the mean of its divisors is an integer number (26085150).

Almost surely, 2^205212551 is an apocalyptic number.

205212551 is a deficient number, since it is larger than the sum of its proper divisors (3468649).

205212551 is a wasteful number, since it uses less digits than its factorization.

205212551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13009.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 205212551 is about 14325.2417431609. The cubic root of 205212551 is about 589.8405688151.

The spelling of 205212551 in words is "two hundred five million, two hundred twelve thousand, five hundred fifty-one".