72531559 has 8 divisors (see below), whose sum is σ = 74461760. Its totient is φ = 70626816.

The previous prime is 72531553. The next prime is 72531593. The reversal of 72531559 is 95513527.

It is a happy number.

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 72531559 - 2⁹ = 72531047 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 (72531553) 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, 522 + ... + 12055.

It is an arithmetic number, because the mean of its divisors is an integer number (9307720).

Almost surely, 2^72531559 is an apocalyptic number.

72531559 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

72531559 is a deficient number, since it is larger than the sum of its proper divisors (1930201).

72531559 is a wasteful number, since it uses less digits than its factorization.

72531559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12729.

The product of its digits is 47250, while the sum is 37.

The square root of 72531559 is about 8516.5461896241. The cubic root of 72531559 is about 417.0380399559.

The spelling of 72531559 in words is "seventy-two million, five hundred thirty-one thousand, five hundred fifty-nine".