205850413531 has 16 divisors (see below), whose sum is σ = 237213614016. Its totient is φ = 174978809856.

The previous prime is 205850413511. The next prime is 205850413577. The reversal of 205850413531 is 135314058502.

It is a cyclic number.

It is not a de Polignac number, because 205850413531 - 2²⁷ = 205716195803 is a prime.

It is a super-2 number, since 2×205850413531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205850413511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 848475 + ... + 1063771.

It is an arithmetic number, because the mean of its divisors is an integer number (14825850876).

Almost surely, 2^205850413531 is an apocalyptic number.

205850413531 is a deficient number, since it is larger than the sum of its proper divisors (31363200485).

205850413531 is a wasteful number, since it uses less digits than its factorization.

205850413531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216438.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 205850413531 in words is "two hundred five billion, eight hundred fifty million, four hundred thirteen thousand, five hundred thirty-one".