205006631 has 2 divisors, whose sum is σ = 205006632. Its totient is φ = 205006630.

The previous prime is 205006583. The next prime is 205006639. The reversal of 205006631 is 136600502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205006631 is a prime.

It is a super-2 number, since 2×205006631² = 84055437507940322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205006597 and 205006606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205006639) 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 as a sum of consecutive naturals, namely, 102503315 + 102503316.

It is an arithmetic number, because the mean of its divisors is an integer number (102503316).

Almost surely, 2^205006631 is an apocalyptic number.

205006631 is a deficient number, since it is larger than the sum of its proper divisors (1).

205006631 is an equidigital number, since it uses as much as digits as its factorization.

205006631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 205006631 is about 14318.0526259684. The cubic root of 205006631 is about 589.6432114602.

The spelling of 205006631 in words is "two hundred five million, six thousand, six hundred thirty-one".