205400531 has 8 divisors (see below), whose sum is σ = 236056320. Its totient is φ = 175072968.

The previous prime is 205400509. The next prime is 205400537. The reversal of 205400531 is 135004502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205400531 - 2¹⁰ = 205399507 is a prime.

It is a super-2 number, since 2×205400531² = 84378756270163922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205400537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80711 + ... + 83216.

It is an arithmetic number, because the mean of its divisors is an integer number (29507040).

Almost surely, 2^205400531 is an apocalyptic number.

205400531 is a deficient number, since it is larger than the sum of its proper divisors (30655789).

205400531 is a wasteful number, since it uses less digits than its factorization.

205400531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164113.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 205400531 is about 14331.8013871251. The cubic root of 205400531 is about 590.0206169182.

The spelling of 205400531 in words is "two hundred five million, four hundred thousand, five hundred thirty-one".