126787657 has 2 divisors, whose sum is σ = 126787658. Its totient is φ = 126787656.

The previous prime is 126787631. The next prime is 126787663. The reversal of 126787657 is 756787621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95472441 + 31315216 = 9771^2 + 5596^2 .

It is an emirp because it is prime and its reverse (756787621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126787657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126787657.

It is not a weakly prime, because it can be changed into another prime (126787667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63393828 + 63393829.

It is an arithmetic number, because the mean of its divisors is an integer number (63393829).

Almost surely, 2^126787657 is an apocalyptic number.

It is an amenable number.

126787657 is a deficient number, since it is larger than the sum of its proper divisors (1).

126787657 is an equidigital number, since it uses as much as digits as its factorization.

126787657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 126787657 is about 11260.0025310832. The cubic root of 126787657 is about 502.3722695407.

The spelling of 126787657 in words is "one hundred twenty-six million, seven hundred eighty-seven thousand, six hundred fifty-seven".