72160531 has 4 divisors (see below), whose sum is σ = 72904552. Its totient is φ = 71416512.

The previous prime is 72160483. The next prime is 72160559. The reversal of 72160531 is 13506127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72160531 is a prime.

It is a super-2 number, since 2×72160531² = 10414284468403922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72160496 and 72160505.

It is not an unprimeable number, because it can be changed into a prime (72160831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371865 + ... + 372058.

It is an arithmetic number, because the mean of its divisors is an integer number (18226138).

Almost surely, 2^72160531 is an apocalyptic number.

72160531 is a deficient number, since it is larger than the sum of its proper divisors (744021).

72160531 is an equidigital number, since it uses as much as digits as its factorization.

72160531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744020.

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

The square root of 72160531 is about 8494.7354873474. The cubic root of 72160531 is about 416.3257183841.

Adding to 72160531 its reverse (13506127), we get a palindrome (85666658).

The spelling of 72160531 in words is "seventy-two million, one hundred sixty thousand, five hundred thirty-one".