206156453 has 8 divisors (see below), whose sum is σ = 211057176. Its totient is φ = 201312000.

The previous prime is 206156449. The next prime is 206156459. The reversal of 206156453 is 354651602.

It can be written as a sum of positive squares in 4 ways, for example, as 61748164 + 144408289 = 7858^2 + 12017^2 .

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 206156453 - 2² = 206156449 is a prime.

It is a super-2 number, since 2×206156453² = 85000966227082418, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206156459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6608 + ... + 21353.

It is an arithmetic number, because the mean of its divisors is an integer number (26382147).

Almost surely, 2^206156453 is an apocalyptic number.

It is an amenable number.

206156453 is a deficient number, since it is larger than the sum of its proper divisors (4900723).

206156453 is a wasteful number, since it uses less digits than its factorization.

206156453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28135.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 206156453 is about 14358.1493584654. The cubic root of 206156453 is about 590.7435354337.

The spelling of 206156453 in words is "two hundred six million, one hundred fifty-six thousand, four hundred fifty-three".