1205243553 has 8 divisors (see below), whose sum is σ = 1608368416. Its totient is φ = 802807200.

The previous prime is 1205243537. The next prime is 1205243573. The reversal of 1205243553 is 3553425021.

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

It is not a de Polignac number, because 1205243553 - 2⁴ = 1205243537 is a prime.

It is a super-2 number, since 2×1205243553² = 2905224044096127618, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1205243553.

It is not an unprimeable number, because it can be changed into a prime (1205243573) 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, 168028 + ... + 175053.

It is an arithmetic number, because the mean of its divisors is an integer number (201046052).

Almost surely, 2^1205243553 is an apocalyptic number.

It is an amenable number.

1205243553 is a deficient number, since it is larger than the sum of its proper divisors (403124863).

1205243553 is a wasteful number, since it uses less digits than its factorization.

1205243553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344255.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 1205243553 is about 34716.6178220172. The cubic root of 1205243553 is about 1064.2041275613.

Adding to 1205243553 its reverse (3553425021), we get a palindrome (4758668574).

The spelling of 1205243553 in words is "one billion, two hundred five million, two hundred forty-three thousand, five hundred fifty-three".