205412531 has 4 divisors (see below), whose sum is σ = 205517592. Its totient is φ = 205307472.

The previous prime is 205412507. The next prime is 205412551. The reversal of 205412531 is 135214502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205412531 is a prime.

It is a super-2 number, since 2×205412531² = 84388615783651922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205412497 and 205412506.

It is not an unprimeable number, because it can be changed into a prime (205412551) 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, 49541 + ... + 53526.

It is an arithmetic number, because the mean of its divisors is an integer number (51379398).

Almost surely, 2^205412531 is an apocalyptic number.

205412531 is a deficient number, since it is larger than the sum of its proper divisors (105061).

205412531 is a wasteful number, since it uses less digits than its factorization.

205412531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105060.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 205412531 is about 14332.2200304070. The cubic root of 205412531 is about 590.0321068423.

The spelling of 205412531 in words is "two hundred five million, four hundred twelve thousand, five hundred thirty-one".