72016531 has 2 divisors, whose sum is σ = 72016532. Its totient is φ = 72016530.

The previous prime is 72016513. The next prime is 72016543. The reversal of 72016531 is 13561027.

Together with previous prime (72016513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13561027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72016531 - 2¹¹ = 72014483 is a prime.

It is a super-2 number, since 2×72016531² = 10372761474547922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72016496 and 72016505.

It is not a weakly prime, because it can be changed into another prime (72016591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36008265 + 36008266.

It is an arithmetic number, because the mean of its divisors is an integer number (36008266).

Almost surely, 2^72016531 is an apocalyptic number.

72016531 is a deficient number, since it is larger than the sum of its proper divisors (1).

72016531 is an equidigital number, since it uses as much as digits as its factorization.

72016531 is an evil number, because the sum of its binary digits is even.

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

The square root of 72016531 is about 8486.2554168491. The cubic root of 72016531 is about 416.0486009385.

Adding to 72016531 its reverse (13561027), we get a palindrome (85577558).

The spelling of 72016531 in words is "seventy-two million, sixteen thousand, five hundred thirty-one".