72126311 has 4 divisors (see below), whose sum is σ = 72220392. Its totient is φ = 72032232.

The previous prime is 72126293. The next prime is 72126317. The reversal of 72126311 is 11362127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11362127 = 7 ⋅1623161.

It is a cyclic number.

It is not a de Polignac number, because 72126311 - 2²⁶ = 5017447 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 (72126317) 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, 45881 + ... + 47426.

It is an arithmetic number, because the mean of its divisors is an integer number (18055098).

Almost surely, 2^72126311 is an apocalyptic number.

72126311 is a deficient number, since it is larger than the sum of its proper divisors (94081).

72126311 is an equidigital number, since it uses as much as digits as its factorization.

72126311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94080.

The product of its digits is 504, while the sum is 23.

The square root of 72126311 is about 8492.7210598253. The cubic root of 72126311 is about 416.2598979211.

Adding to 72126311 its reverse (11362127), we get a palindrome (83488438).

The spelling of 72126311 in words is "seventy-two million, one hundred twenty-six thousand, three hundred eleven".