126537989 has 2 divisors, whose sum is σ = 126537990. Its totient is φ = 126537988.

The previous prime is 126537937. The next prime is 126537997. The reversal of 126537989 is 989735621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66552964 + 59985025 = 8158^2 + 7745^2 .

It is a cyclic number.

It is not a de Polignac number, because 126537989 - 2¹⁶ = 126472453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126507989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63268994 + 63268995.

It is an arithmetic number, because the mean of its divisors is an integer number (63268995).

Almost surely, 2^126537989 is an apocalyptic number.

It is an amenable number.

126537989 is a deficient number, since it is larger than the sum of its proper divisors (1).

126537989 is an equidigital number, since it uses as much as digits as its factorization.

126537989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 50.

The square root of 126537989 is about 11248.9105694729. The cubic root of 126537989 is about 502.0422986744.

The spelling of 126537989 in words is "one hundred twenty-six million, five hundred thirty-seven thousand, nine hundred eighty-nine".