1231342505 has 8 divisors (see below), whose sum is σ = 1483743624. Its totient is φ = 980985600.

The previous prime is 1231342477. The next prime is 1231342517. The reversal of 1231342505 is 5052431321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9909904 + 1221432601 = 3148^2 + 34949^2 .

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

It is not a de Polignac number, because 1231342505 - 2¹⁴ = 1231326121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509726 + ... + 512135.

It is an arithmetic number, because the mean of its divisors is an integer number (185467953).

Almost surely, 2^1231342505 is an apocalyptic number.

It is an amenable number.

1231342505 is a deficient number, since it is larger than the sum of its proper divisors (252401119).

1231342505 is a wasteful number, since it uses less digits than its factorization.

1231342505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022107.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1231342505 is about 35090.4902359599. The cubic root of 1231342505 is about 1071.8309423875.

Adding to 1231342505 its reverse (5052431321), we get a palindrome (6283773826).

The spelling of 1231342505 in words is "one billion, two hundred thirty-one million, three hundred forty-two thousand, five hundred five".