1205104523 has 4 divisors (see below), whose sum is σ = 1377262320. Its totient is φ = 1032946728.

The previous prime is 1205104499. The next prime is 1205104609. The reversal of 1205104523 is 3254015021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1205104523 - 2¹⁶ = 1205038987 is a prime.

It is a super-2 number, since 2×1205104523² = 2904553822710115058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1205104723) 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, 86078888 + ... + 86078901.

It is an arithmetic number, because the mean of its divisors is an integer number (344315580).

Almost surely, 2^1205104523 is an apocalyptic number.

1205104523 is a deficient number, since it is larger than the sum of its proper divisors (172157797).

1205104523 is an equidigital number, since it uses as much as digits as its factorization.

1205104523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172157796.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1205104523 is about 34714.6154090752. The cubic root of 1205104523 is about 1064.1632058215.

Adding to 1205104523 its reverse (3254015021), we get a palindrome (4459119544).

The spelling of 1205104523 in words is "one billion, two hundred five million, one hundred four thousand, five hundred twenty-three".