126147521 has 2 divisors, whose sum is σ = 126147522. Its totient is φ = 126147520.

The previous prime is 126147503. The next prime is 126147523. The reversal of 126147521 is 125741621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84364225 + 41783296 = 9185^2 + 6464^2 .

It is a cyclic number.

It is not a de Polignac number, because 126147521 - 2⁶ = 126147457 is a prime.

It is a super-4 number, since 4×126147521⁴ (a number of 34 digits) contains 4444 as substring.

Together with 126147523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126147523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63073760 + 63073761.

It is an arithmetic number, because the mean of its divisors is an integer number (63073761).

Almost surely, 2^126147521 is an apocalyptic number.

It is an amenable number.

126147521 is a deficient number, since it is larger than the sum of its proper divisors (1).

126147521 is an equidigital number, since it uses as much as digits as its factorization.

126147521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 126147521 is about 11231.5413456925. The cubic root of 126147521 is about 501.5253697620.

The spelling of 126147521 in words is "one hundred twenty-six million, one hundred forty-seven thousand, five hundred twenty-one".