72143591 has 8 divisors (see below), whose sum is σ = 78018864. Its totient is φ = 66314880.

The previous prime is 72143587. The next prime is 72143609. The reversal of 72143591 is 19534127.

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 72143591 - 2² = 72143587 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 (72143531) 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, 8381 + ... + 14646.

It is an arithmetic number, because the mean of its divisors is an integer number (9752358).

Almost surely, 2^72143591 is an apocalyptic number.

72143591 is a deficient number, since it is larger than the sum of its proper divisors (5875273).

72143591 is a wasteful number, since it uses less digits than its factorization.

72143591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23281.

The product of its digits is 7560, while the sum is 32.

The square root of 72143591 is about 8493.7383406837. The cubic root of 72143591 is about 416.2931377406.

The spelling of 72143591 in words is "seventy-two million, one hundred forty-three thousand, five hundred ninety-one".