72159973 has 2 divisors, whose sum is σ = 72159974. Its totient is φ = 72159972.

The previous prime is 72159931. The next prime is 72160021. The reversal of 72159973 is 37995127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71115489 + 1044484 = 8433^2 + 1022^2 .

It is an emirp because it is prime and its reverse (37995127) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72159973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72159673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36079986 + 36079987.

It is an arithmetic number, because the mean of its divisors is an integer number (36079987).

Almost surely, 2^72159973 is an apocalyptic number.

It is an amenable number.

72159973 is a deficient number, since it is larger than the sum of its proper divisors (1).

72159973 is an equidigital number, since it uses as much as digits as its factorization.

72159973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 43.

The square root of 72159973 is about 8494.7026434125. The cubic root of 72159973 is about 416.3246452659.

The spelling of 72159973 in words is "seventy-two million, one hundred fifty-nine thousand, nine hundred seventy-three".