126781849 has 2 divisors, whose sum is σ = 126781850. Its totient is φ = 126781848.

The previous prime is 126781843. The next prime is 126781867. The reversal of 126781849 is 948187621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76825225 + 49956624 = 8765^2 + 7068^2 .

It is a cyclic number.

It is not a de Polignac number, because 126781849 - 2⁵ = 126781817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 126781799 and 126781808.

It is not a weakly prime, because it can be changed into another prime (126781843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63390924 + 63390925.

It is an arithmetic number, because the mean of its divisors is an integer number (63390925).

Almost surely, 2^126781849 is an apocalyptic number.

It is an amenable number.

126781849 is a deficient number, since it is larger than the sum of its proper divisors (1).

126781849 is an equidigital number, since it uses as much as digits as its factorization.

126781849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 46.

The square root of 126781849 is about 11259.7446241023. The cubic root of 126781849 is about 502.3645983873.

The spelling of 126781849 in words is "one hundred twenty-six million, seven hundred eighty-one thousand, eight hundred forty-nine".