126202091 has 4 divisors (see below), whose sum is σ = 126279912. Its totient is φ = 126124272.

The previous prime is 126202057. The next prime is 126202093. The reversal of 126202091 is 190202621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190202621 = 7 ⋅27171803.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126202091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126202093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36425 + ... + 39738.

It is an arithmetic number, because the mean of its divisors is an integer number (31569978).

Almost surely, 2^126202091 is an apocalyptic number.

126202091 is a deficient number, since it is larger than the sum of its proper divisors (77821).

126202091 is an equidigital number, since it uses as much as digits as its factorization.

126202091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77820.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 126202091 is about 11233.9704023110. The cubic root of 126202091 is about 501.5976774162.

The spelling of 126202091 in words is "one hundred twenty-six million, two hundred two thousand, ninety-one".