205136387 has 2 divisors, whose sum is σ = 205136388. Its totient is φ = 205136386.

The previous prime is 205136383. The next prime is 205136411. The reversal of 205136387 is 783631502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205136387 - 2² = 205136383 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205136381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102568193 + 102568194.

It is an arithmetic number, because the mean of its divisors is an integer number (102568194).

Almost surely, 2^205136387 is an apocalyptic number.

205136387 is a deficient number, since it is larger than the sum of its proper divisors (1).

205136387 is an equidigital number, since it uses as much as digits as its factorization.

205136387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 205136387 is about 14322.5831119948. The cubic root of 205136387 is about 589.7675872880.

Adding to 205136387 its reverse (783631502), we get a palindrome (988767889).

The spelling of 205136387 in words is "two hundred five million, one hundred thirty-six thousand, three hundred eighty-seven".