206971913 has 2 divisors, whose sum is σ = 206971914. Its totient is φ = 206971912.

The previous prime is 206971909. The next prime is 206971931. The reversal of 206971913 is 319179602.

It is a happy number.

Together with next prime (206971931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190219264 + 16752649 = 13792^2 + 4093^2 .

It is a cyclic number.

It is not a de Polignac number, because 206971913 - 2² = 206971909 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206977913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103485956 + 103485957.

It is an arithmetic number, because the mean of its divisors is an integer number (103485957).

Almost surely, 2^206971913 is an apocalyptic number.

It is an amenable number.

206971913 is a deficient number, since it is larger than the sum of its proper divisors (1).

206971913 is an equidigital number, since it uses as much as digits as its factorization.

206971913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 206971913 is about 14386.5184461008. The cubic root of 206971913 is about 591.5214138268.

The spelling of 206971913 in words is "two hundred six million, nine hundred seventy-one thousand, nine hundred thirteen".