1231434257 has 2 divisors, whose sum is σ = 1231434258. Its totient is φ = 1231434256.

The previous prime is 1231434187. The next prime is 1231434271. The reversal of 1231434257 is 7524341321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 943656961 + 287777296 = 30719^2 + 16964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231434257 - 2²⁸ = 962998801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231434557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615717128 + 615717129.

It is an arithmetic number, because the mean of its divisors is an integer number (615717129).

Almost surely, 2^1231434257 is an apocalyptic number.

It is an amenable number.

1231434257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231434257 is an equidigital number, since it uses as much as digits as its factorization.

1231434257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 32.

The square root of 1231434257 is about 35091.7975743620. The cubic root of 1231434257 is about 1071.8575637892.

Adding to 1231434257 its reverse (7524341321), we get a palindrome (8755775578).

The spelling of 1231434257 in words is "one billion, two hundred thirty-one million, four hundred thirty-four thousand, two hundred fifty-seven".