1231457305 has 64 divisors (see below), whose sum is σ = 1767951360. Its totient is φ = 814657536.

The previous prime is 1231457291. The next prime is 1231457309. The reversal of 1231457305 is 5037541321.

It is a happy number.

It is a 4-Lehmer number, since φ(1231457305) divides (1231457305-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 1231457305 - 2²³ = 1223068697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231457309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2659504 + ... + 2659966.

It is an arithmetic number, because the mean of its divisors is an integer number (27624240).

It is a Poulet number, since it divides 2^1231457304-1.

Almost surely, 2^1231457305 is an apocalyptic number.

It is an amenable number.

1231457305 is a deficient number, since it is larger than the sum of its proper divisors (536494055).

1231457305 is a wasteful number, since it uses less digits than its factorization.

1231457305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 1231457305 is about 35092.1259686557. The cubic root of 1231457305 is about 1071.8642508477.

Adding to 1231457305 its reverse (5037541321), we get a palindrome (6268998626).

The spelling of 1231457305 in words is "one billion, two hundred thirty-one million, four hundred fifty-seven thousand, three hundred five".