126255557 has 2 divisors, whose sum is σ = 126255558. Its totient is φ = 126255556.

The previous prime is 126255541. The next prime is 126255559. The reversal of 126255557 is 755552621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84897796 + 41357761 = 9214^2 + 6431^2 .

It is an emirp because it is prime and its reverse (755552621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126255557 - 2⁴ = 126255541 is a prime.

Together with 126255559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126255557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126255559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63127778 + 63127779.

It is an arithmetic number, because the mean of its divisors is an integer number (63127779).

Almost surely, 2^126255557 is an apocalyptic number.

It is an amenable number.

126255557 is a deficient number, since it is larger than the sum of its proper divisors (1).

126255557 is an equidigital number, since it uses as much as digits as its factorization.

126255557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105000, while the sum is 38.

The square root of 126255557 is about 11236.3498076555. The cubic root of 126255557 is about 501.6685020088.

The spelling of 126255557 in words is "one hundred twenty-six million, two hundred fifty-five thousand, five hundred fifty-seven".