72173029 has 2 divisors, whose sum is σ = 72173030. Its totient is φ = 72173028.

The previous prime is 72172999. The next prime is 72173033. The reversal of 72173029 is 92037127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59320804 + 12852225 = 7702^2 + 3585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72173029 is a prime.

It is a super-2 number, since 2×72173029² = 10417892230069682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72173069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36086514 + 36086515.

It is an arithmetic number, because the mean of its divisors is an integer number (36086515).

Almost surely, 2^72173029 is an apocalyptic number.

It is an amenable number.

72173029 is a deficient number, since it is larger than the sum of its proper divisors (1).

72173029 is an equidigital number, since it uses as much as digits as its factorization.

72173029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 72173029 is about 8495.4710875854. The cubic root of 72173029 is about 416.3497524758.

The spelling of 72173029 in words is "seventy-two million, one hundred seventy-three thousand, twenty-nine".