205650631 has 4 divisors (see below), whose sum is σ = 206272264. Its totient is φ = 205029000.

The previous prime is 205650619. The next prime is 205650691. The reversal of 205650631 is 136056502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136056502 = 2 ⋅68028251.

It is a cyclic number.

It is not a de Polignac number, because 205650631 - 2⁷ = 205650503 is a prime.

It is a super-2 number, since 2×205650631² = 84584364061396322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205650631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205650691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310320 + ... + 310981.

It is an arithmetic number, because the mean of its divisors is an integer number (51568066).

Almost surely, 2^205650631 is an apocalyptic number.

205650631 is a deficient number, since it is larger than the sum of its proper divisors (621633).

205650631 is an equidigital number, since it uses as much as digits as its factorization.

205650631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621632.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 205650631 is about 14340.5240838681. The cubic root of 205650631 is about 590.2599936190.

The spelling of 205650631 in words is "two hundred five million, six hundred fifty thousand, six hundred thirty-one".