206154122 has 4 divisors (see below), whose sum is σ = 309231186. Its totient is φ = 103077060.

The previous prime is 206154119. The next prime is 206154133. The reversal of 206154122 is 221451602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221451602 = 2 ⋅110725801.

It can be written as a sum of positive squares in only one way, i.e., 158281561 + 47872561 = 12581^2 + 6919^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51538529 + ... + 51538532.

Almost surely, 2^206154122 is an apocalyptic number.

206154122 is a deficient number, since it is larger than the sum of its proper divisors (103077064).

206154122 is a wasteful number, since it uses less digits than its factorization.

206154122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103077063.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 206154122 is about 14358.0681848221. The cubic root of 206154122 is about 590.7413089234.

The spelling of 206154122 in words is "two hundred six million, one hundred fifty-four thousand, one hundred twenty-two".