126640901 has 2 divisors, whose sum is σ = 126640902. Its totient is φ = 126640900.

The previous prime is 126640867. The next prime is 126640907. The reversal of 126640901 is 109046621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117700801 + 8940100 = 10849^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 126640901 - 2²⁶ = 59532037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126640907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63320450 + 63320451.

It is an arithmetic number, because the mean of its divisors is an integer number (63320451).

Almost surely, 2^126640901 is an apocalyptic number.

It is an amenable number.

126640901 is a deficient number, since it is larger than the sum of its proper divisors (1).

126640901 is an equidigital number, since it uses as much as digits as its factorization.

126640901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 126640901 is about 11253.4839494265. The cubic root of 126640901 is about 502.1783636808.

The spelling of 126640901 in words is "one hundred twenty-six million, six hundred forty thousand, nine hundred one".