1205040131 has 4 divisors (see below), whose sum is σ = 1225464600. Its totient is φ = 1184615664.

The previous prime is 1205040079. The next prime is 1205040163. The reversal of 1205040131 is 1310405021.

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 1205040131 - 2¹⁰ = 1205039107 is a prime.

It is a super-2 number, since 2×1205040131² = 2904243434640994322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205040181) 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, 10212146 + ... + 10212263.

It is an arithmetic number, because the mean of its divisors is an integer number (306366150).

Almost surely, 2^1205040131 is an apocalyptic number.

1205040131 is a deficient number, since it is larger than the sum of its proper divisors (20424469).

1205040131 is an equidigital number, since it uses as much as digits as its factorization.

1205040131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20424468.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1205040131 is about 34713.6879487040. The cubic root of 1205040131 is about 1064.1442517761.

Adding to 1205040131 its reverse (1310405021), we get a palindrome (2515445152).

The spelling of 1205040131 in words is "one billion, two hundred five million, forty thousand, one hundred thirty-one".