205545431 has 8 divisors (see below), whose sum is σ = 252979104. Its totient is φ = 162629280.

The previous prime is 205545427. The next prime is 205545449. The reversal of 205545431 is 134545502.

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

It is a cyclic number.

It is not a de Polignac number, because 205545431 - 2² = 205545427 is a prime.

It is a super-2 number, since 2×205545431² = 84497848409951522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205545394 and 205545403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205545421) 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, 1129280 + ... + 1129461.

It is an arithmetic number, because the mean of its divisors is an integer number (31622388).

Almost surely, 2^205545431 is an apocalyptic number.

205545431 is a deficient number, since it is larger than the sum of its proper divisors (47433673).

205545431 is a wasteful number, since it uses less digits than its factorization.

205545431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258761.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 205545431 is about 14336.8556873535. The cubic root of 205545431 is about 590.1593278405.

The spelling of 205545431 in words is "two hundred five million, five hundred forty-five thousand, four hundred thirty-one".