126500261 has 4 divisors (see below), whose sum is σ = 126716352. Its totient is φ = 126284172.

The previous prime is 126500237. The next prime is 126500263. The reversal of 126500261 is 162005621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 162005621 = 2381 ⋅68041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126500261 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 (126500263) 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, 107165 + ... + 108338.

It is an arithmetic number, because the mean of its divisors is an integer number (31679088).

Almost surely, 2^126500261 is an apocalyptic number.

It is an amenable number.

126500261 is a deficient number, since it is larger than the sum of its proper divisors (216091).

126500261 is an equidigital number, since it uses as much as digits as its factorization.

126500261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216090.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 126500261 is about 11247.2334820613. The cubic root of 126500261 is about 501.9923981537.

Adding to 126500261 its reverse (162005621), we get a palindrome (288505882).

The spelling of 126500261 in words is "one hundred twenty-six million, five hundred thousand, two hundred sixty-one".