1231245305 has 4 divisors (see below), whose sum is σ = 1477494372. Its totient is φ = 984996240.

The previous prime is 1231245299. The next prime is 1231245311. The reversal of 1231245305 is 5035421321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5035421321 = 7 ⋅719345903.

It is an interprime number because it is at equal distance from previous prime (1231245299) and next prime (1231245311).

It can be written as a sum of positive squares in 2 ways, for example, as 194212096 + 1037033209 = 13936^2 + 32203^2 .

It is not a de Polignac number, because 1231245305 - 2⁶ = 1231245241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123124526 + ... + 123124535.

It is an arithmetic number, because the mean of its divisors is an integer number (369373593).

Almost surely, 2^1231245305 is an apocalyptic number.

It is an amenable number.

1231245305 is a deficient number, since it is larger than the sum of its proper divisors (246249067).

1231245305 is an equidigital number, since it uses as much as digits as its factorization.

1231245305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246249066.

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

The square root of 1231245305 is about 35089.1052180018. The cubic root of 1231245305 is about 1071.8027388323.

Adding to 1231245305 its reverse (5035421321), we get a palindrome (6266666626).

The spelling of 1231245305 in words is "one billion, two hundred thirty-one million, two hundred forty-five thousand, three hundred five".