126301561 has 2 divisors, whose sum is σ = 126301562. Its totient is φ = 126301560.

The previous prime is 126301559. The next prime is 126301573. The reversal of 126301561 is 165103621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125865961 + 435600 = 11219^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 126301561 - 2¹ = 126301559 is a prime.

It is a super-2 number, since 2×126301561² = 31904168622073442, which contains 22 as substring.

Together with 126301559, it forms a pair of twin primes.

It is equal to p_7180009 and since 126301561 and 7180009 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (126301501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63150780 + 63150781.

It is an arithmetic number, because the mean of its divisors is an integer number (63150781).

Almost surely, 2^126301561 is an apocalyptic number.

It is an amenable number.

126301561 is a deficient number, since it is larger than the sum of its proper divisors (1).

126301561 is an equidigital number, since it uses as much as digits as its factorization.

126301561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 126301561 is about 11238.3967272917. The cubic root of 126301561 is about 501.7294259417.

The spelling of 126301561 in words is "one hundred twenty-six million, three hundred one thousand, five hundred sixty-one".