206555351 has 4 divisors (see below), whose sum is σ = 206606304. Its totient is φ = 206504400.

The previous prime is 206555339. The next prime is 206555357. The reversal of 206555351 is 153555602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 153555602 = 2 ⋅76777801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206555351 is a prime.

It is a super-2 number, since 2×206555351² = 85330226053466402, 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 (206555357) 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, 18815 + ... + 27696.

It is an arithmetic number, because the mean of its divisors is an integer number (51651576).

Almost surely, 2^206555351 is an apocalyptic number.

206555351 is a deficient number, since it is larger than the sum of its proper divisors (50953).

206555351 is an equidigital number, since it uses as much as digits as its factorization.

206555351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50952.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 206555351 is about 14372.0336417641. The cubic root of 206555351 is about 591.1243054560.

The spelling of 206555351 in words is "two hundred six million, five hundred fifty-five thousand, three hundred fifty-one".