72143311 has 8 divisors (see below), whose sum is σ = 73416240. Its totient is φ = 70880832.

The previous prime is 72143299. The next prime is 72143321. The reversal of 72143311 is 11334127.

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

It is a cyclic number.

It is not a de Polignac number, because 72143311 - 2²³ = 63754703 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 (72143321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12021 + ... + 16993.

It is an arithmetic number, because the mean of its divisors is an integer number (9177030).

Almost surely, 2^72143311 is an apocalyptic number.

72143311 is a deficient number, since it is larger than the sum of its proper divisors (1272929).

72143311 is a wasteful number, since it uses less digits than its factorization.

72143311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5225.

The product of its digits is 504, while the sum is 22.

The square root of 72143311 is about 8493.7218579372. The cubic root of 72143311 is about 416.2925991747.

Adding to 72143311 its reverse (11334127), we get a palindrome (83477438).

The spelling of 72143311 in words is "seventy-two million, one hundred forty-three thousand, three hundred eleven".