72156841 has 4 divisors (see below), whose sum is σ = 72831312. Its totient is φ = 71482372.

The previous prime is 72156827. The next prime is 72156883. The reversal of 72156841 is 14865127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72156841 - 2⁷ = 72156713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72156797 and 72156806.

It is not an unprimeable number, because it can be changed into a prime (72156541) 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, 337075 + ... + 337288.

It is an arithmetic number, because the mean of its divisors is an integer number (18207828).

Almost surely, 2^72156841 is an apocalyptic number.

It is an amenable number.

72156841 is a deficient number, since it is larger than the sum of its proper divisors (674471).

72156841 is a wasteful number, since it uses less digits than its factorization.

72156841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674470.

The product of its digits is 13440, while the sum is 34.

The square root of 72156841 is about 8494.5182912276. The cubic root of 72156841 is about 416.3186218543.

The spelling of 72156841 in words is "seventy-two million, one hundred fifty-six thousand, eight hundred forty-one".