72001911 has 4 divisors (see below), whose sum is σ = 96002552. Its totient is φ = 48001272.

The previous prime is 72001859. The next prime is 72001939. The reversal of 72001911 is 11910027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11910027 = 3 ⋅3970009.

It is not a de Polignac number, because 72001911 - 2⁶ = 72001847 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 (72006911) 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, 12000316 + ... + 12000321.

It is an arithmetic number, because the mean of its divisors is an integer number (24000638).

Almost surely, 2^72001911 is an apocalyptic number.

72001911 is a deficient number, since it is larger than the sum of its proper divisors (24000641).

72001911 is a wasteful number, since it uses less digits than its factorization.

72001911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24000640.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 72001911 is about 8485.3939802463. The cubic root of 72001911 is about 416.0204451706.

Adding to 72001911 its reverse (11910027), we get a palindrome (83911938).

The spelling of 72001911 in words is "seventy-two million, one thousand, nine hundred eleven".