126780001 has 2 divisors, whose sum is σ = 126780002. Its totient is φ = 126780000.

The previous prime is 126779993. The next prime is 126780023. The reversal of 126780001 is 100087621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126675025 + 104976 = 11255^2 + 324^2 .

It is a cyclic number.

It is not a de Polignac number, because 126780001 - 2³ = 126779993 is a prime.

It is not a weakly prime, because it can be changed into another prime (126780061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63390000 + 63390001.

It is an arithmetic number, because the mean of its divisors is an integer number (63390001).

Almost surely, 2^126780001 is an apocalyptic number.

It is an amenable number.

126780001 is a deficient number, since it is larger than the sum of its proper divisors (1).

126780001 is an equidigital number, since it uses as much as digits as its factorization.

126780001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 126780001 is about 11259.6625615513. The cubic root of 126780001 is about 502.3621575166.

The spelling of 126780001 in words is "one hundred twenty-six million, seven hundred eighty thousand, one".