126502991 has 8 divisors (see below), whose sum is σ = 129475584. Its totient is φ = 123542200.

The previous prime is 126502979. The next prime is 126503009. The reversal of 126502991 is 199205621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126502991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126502951) 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 in 7 ways as a sum of consecutive naturals, for example, 20966 + ... + 26316.

It is an arithmetic number, because the mean of its divisors is an integer number (16184448).

Almost surely, 2^126502991 is an apocalyptic number.

126502991 is a deficient number, since it is larger than the sum of its proper divisors (2972593).

126502991 is an equidigital number, since it uses as much as digits as its factorization.

126502991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5901.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 126502991 is about 11247.3548445846. The cubic root of 126502991 is about 501.9960092909.

The spelling of 126502991 in words is "one hundred twenty-six million, five hundred two thousand, nine hundred ninety-one".