126642499 has 2 divisors, whose sum is σ = 126642500. Its totient is φ = 126642498.

The previous prime is 126642473. The next prime is 126642553. The reversal of 126642499 is 994246621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126642499 is a prime.

It is not a weakly prime, because it can be changed into another prime (126642419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63321249 + 63321250.

It is an arithmetic number, because the mean of its divisors is an integer number (63321250).

Almost surely, 2^126642499 is an apocalyptic number.

126642499 is a deficient number, since it is larger than the sum of its proper divisors (1).

126642499 is an equidigital number, since it uses as much as digits as its factorization.

126642499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 43.

The square root of 126642499 is about 11253.5549494371. The cubic root of 126642499 is about 502.1804758937.

The spelling of 126642499 in words is "one hundred twenty-six million, six hundred forty-two thousand, four hundred ninety-nine".