126377561 has 2 divisors, whose sum is σ = 126377562. Its totient is φ = 126377560.

The previous prime is 126377557. The next prime is 126377579. The reversal of 126377561 is 165773621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108264025 + 18113536 = 10405^2 + 4256^2 .

It is a cyclic number.

It is not a de Polignac number, because 126377561 - 2² = 126377557 is a prime.

It is not a weakly prime, because it can be changed into another prime (126377861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63188780 + 63188781.

It is an arithmetic number, because the mean of its divisors is an integer number (63188781).

Almost surely, 2^126377561 is an apocalyptic number.

It is an amenable number.

126377561 is a deficient number, since it is larger than the sum of its proper divisors (1).

126377561 is an equidigital number, since it uses as much as digits as its factorization.

126377561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 126377561 is about 11241.7774840103. Note that the first 3 decimals coincide. The cubic root of 126377561 is about 501.8300417227.

The spelling of 126377561 in words is "one hundred twenty-six million, three hundred seventy-seven thousand, five hundred sixty-one".