205503131 has 2 divisors, whose sum is σ = 205503132. Its totient is φ = 205503130.

The previous prime is 205503127. The next prime is 205503139. The reversal of 205503131 is 131305502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205503131 - 2² = 205503127 is a prime.

It is a super-2 number, since 2×205503131² = 84463073701606322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205503139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102751565 + 102751566.

It is an arithmetic number, because the mean of its divisors is an integer number (102751566).

Almost surely, 2^205503131 is an apocalyptic number.

205503131 is a deficient number, since it is larger than the sum of its proper divisors (1).

205503131 is an equidigital number, since it uses as much as digits as its factorization.

205503131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 205503131 is about 14335.3803925811. The cubic root of 205503131 is about 590.1188413293.

Adding to 205503131 its reverse (131305502), we get a palindrome (336808633).

The spelling of 205503131 in words is "two hundred five million, five hundred three thousand, one hundred thirty-one".