126912521 has 2 divisors, whose sum is σ = 126912522. Its totient is φ = 126912520.

The previous prime is 126912503. The next prime is 126912547. The reversal of 126912521 is 125219621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126810121 + 102400 = 11261^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 126912521 - 2¹⁴ = 126896137 is a prime.

It is a super-2 number, since 2×126912521² = 32213575973150882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126914521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63456260 + 63456261.

It is an arithmetic number, because the mean of its divisors is an integer number (63456261).

Almost surely, 2^126912521 is an apocalyptic number.

It is an amenable number.

126912521 is a deficient number, since it is larger than the sum of its proper divisors (1).

126912521 is an equidigital number, since it uses as much as digits as its factorization.

126912521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 126912521 is about 11265.5457479875. The cubic root of 126912521 is about 502.5371321455.

The spelling of 126912521 in words is "one hundred twenty-six million, nine hundred twelve thousand, five hundred twenty-one".