126311257 has 2 divisors, whose sum is σ = 126311258. Its totient is φ = 126311256.

The previous prime is 126311249. The next prime is 126311347. The reversal of 126311257 is 752113621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92717641 + 33593616 = 9629^2 + 5796^2 .

It is a cyclic number.

It is not a de Polignac number, because 126311257 - 2³ = 126311249 is a prime.

It is not a weakly prime, because it can be changed into another prime (126311357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63155628 + 63155629.

It is an arithmetic number, because the mean of its divisors is an integer number (63155629).

Almost surely, 2^126311257 is an apocalyptic number.

It is an amenable number.

126311257 is a deficient number, since it is larger than the sum of its proper divisors (1).

126311257 is an equidigital number, since it uses as much as digits as its factorization.

126311257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 126311257 is about 11238.8280972706. The cubic root of 126311257 is about 501.7422646430.

Adding to 126311257 its reverse (752113621), we get a palindrome (878424878).

The spelling of 126311257 in words is "one hundred twenty-six million, three hundred eleven thousand, two hundred fifty-seven".