72147001 has 2 divisors, whose sum is σ = 72147002. Its totient is φ = 72147000.

The previous prime is 72146993. The next prime is 72147043. The reversal of 72147001 is 10074127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50765625 + 21381376 = 7125^2 + 4624^2 .

It is a cyclic number.

It is not a de Polignac number, because 72147001 - 2³ = 72146993 is a prime.

It is not a weakly prime, because it can be changed into another prime (72147091) 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 as a sum of consecutive naturals, namely, 36073500 + 36073501.

It is an arithmetic number, because the mean of its divisors is an integer number (36073501).

Almost surely, 2^72147001 is an apocalyptic number.

It is an amenable number.

72147001 is a deficient number, since it is larger than the sum of its proper divisors (1).

72147001 is an equidigital number, since it uses as much as digits as its factorization.

72147001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 72147001 is about 8493.9390744224. The cubic root of 72147001 is about 416.2996965918.

The spelling of 72147001 in words is "seventy-two million, one hundred forty-seven thousand, one".