206722157 has 4 divisors (see below), whose sum is σ = 206962560. Its totient is φ = 206481756.

The previous prime is 206722141. The next prime is 206722163. The reversal of 206722157 is 751227602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206722157 - 2⁴ = 206722141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206722757) 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 3 ways as a sum of consecutive naturals, for example, 118907 + ... + 120632.

It is an arithmetic number, because the mean of its divisors is an integer number (51740640).

Almost surely, 2^206722157 is an apocalyptic number.

It is an amenable number.

206722157 is a deficient number, since it is larger than the sum of its proper divisors (240403).

206722157 is an equidigital number, since it uses as much as digits as its factorization.

206722157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240402.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 206722157 is about 14377.8356159750. The cubic root of 206722157 is about 591.2833855761.

Adding to 206722157 its reverse (751227602), we get a palindrome (957949759).

Subtracting 206722157 from its reverse (751227602), we obtain a palindrome (544505445).

The spelling of 206722157 in words is "two hundred six million, seven hundred twenty-two thousand, one hundred fifty-seven".