1205142555 has 16 divisors (see below), whose sum is σ = 1960911360. Its totient is φ = 631848288.

The previous prime is 1205142541. The next prime is 1205142559. The reversal of 1205142555 is 5552415021.

It is not a de Polignac number, because 1205142555 - 2¹¹ = 1205140507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205142559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 679987 + ... + 681756.

It is an arithmetic number, because the mean of its divisors is an integer number (122556960).

Almost surely, 2^1205142555 is an apocalyptic number.

1205142555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1205142555 is a deficient number, since it is larger than the sum of its proper divisors (755768805).

1205142555 is a wasteful number, since it uses less digits than its factorization.

1205142555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361810.

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 1205142555 is about 34715.1631855591. The cubic root of 1205142555 is about 1064.1744003772.

Adding to 1205142555 its reverse (5552415021), we get a palindrome (6757557576).

The spelling of 1205142555 in words is "one billion, two hundred five million, one hundred forty-two thousand, five hundred fifty-five".