1205510155 has 16 divisors (see below), whose sum is σ = 1510447104. Its totient is φ = 921903840.

The previous prime is 1205510149. The next prime is 1205510219. The reversal of 1205510155 is 5510155021.

It is not a de Polignac number, because 1205510155 - 2³ = 1205510147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330190 + ... + 333820.

It is an arithmetic number, because the mean of its divisors is an integer number (94402944).

Almost surely, 2^1205510155 is an apocalyptic number.

1205510155 is a deficient number, since it is larger than the sum of its proper divisors (304936949).

1205510155 is a wasteful number, since it uses less digits than its factorization.

1205510155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6546.

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 1205510155 is about 34720.4572982557. The cubic root of 1205510155 is about 1064.2825897197.

Adding to 1205510155 its reverse (5510155021), we get a palindrome (6715665176).

The spelling of 1205510155 in words is "one billion, two hundred five million, five hundred ten thousand, one hundred fifty-five".