72106531 has 8 divisors (see below), whose sum is σ = 82827360. Its totient is φ = 61490688.

The previous prime is 72106523. The next prime is 72106547. The reversal of 72106531 is 13560127.

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

It is not a de Polignac number, because 72106531 - 2³ = 72106523 is a prime.

It is a super-2 number, since 2×72106531² = 10398703625707922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72106496 and 72106505.

It is not an unprimeable number, because it can be changed into a prime (72106591) 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, 24766 + ... + 27523.

It is an arithmetic number, because the mean of its divisors is an integer number (10353420).

Almost surely, 2^72106531 is an apocalyptic number.

72106531 is a deficient number, since it is larger than the sum of its proper divisors (10720829).

72106531 is a wasteful number, since it uses less digits than its factorization.

72106531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52493.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 72106531 is about 8491.5564533247. The cubic root of 72106531 is about 416.2218425825.

Adding to 72106531 its reverse (13560127), we get a palindrome (85666658).

The spelling of 72106531 in words is "seventy-two million, one hundred six thousand, five hundred thirty-one".