206121613 has 8 divisors (see below), whose sum is σ = 207603200. Its totient is φ = 204644880.

The previous prime is 206121577. The next prime is 206121631. The reversal of 206121613 is 316121602.

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 206121613 - 2¹⁷ = 205990541 is a prime.

It is a super-2 number, since 2×206121613² = 84972238691443538, 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 (206121673) 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, 130756 + ... + 132322.

It is an arithmetic number, because the mean of its divisors is an integer number (25950400).

Almost surely, 2^206121613 is an apocalyptic number.

It is an amenable number.

206121613 is a deficient number, since it is larger than the sum of its proper divisors (1481587).

206121613 is a wasteful number, since it uses less digits than its factorization.

206121613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 206121613 is about 14356.9360589229. The cubic root of 206121613 is about 590.7102554272.

The spelling of 206121613 in words is "two hundred six million, one hundred twenty-one thousand, six hundred thirteen".