1205662543 has 4 divisors (see below), whose sum is σ = 1205734680. Its totient is φ = 1205590408.

The previous prime is 1205662481. The next prime is 1205662631. The reversal of 1205662543 is 3452665021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1205662543 - 2²⁵ = 1172108111 is a prime.

It is a super-3 number, since 3×1205662543³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1205662499 and 1205662508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205662243) 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, 3396 + ... + 49222.

It is an arithmetic number, because the mean of its divisors is an integer number (301433670).

Almost surely, 2^1205662543 is an apocalyptic number.

1205662543 is a deficient number, since it is larger than the sum of its proper divisors (72137).

1205662543 is an equidigital number, since it uses as much as digits as its factorization.

1205662543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72136.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 1205662543 is about 34722.6517276547. The cubic root of 1205662543 is about 1064.3274329924.

The spelling of 1205662543 in words is "one billion, two hundred five million, six hundred sixty-two thousand, five hundred forty-three".