72071897 has 2 divisors, whose sum is σ = 72071898. Its totient is φ = 72071896.

The previous prime is 72071849. The next prime is 72071929. The reversal of 72071897 is 79817027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40081561 + 31990336 = 6331^2 + 5656^2 .

It is an emirp because it is prime and its reverse (79817027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72071897 - 2¹⁴ = 72055513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72071837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36035948 + 36035949.

It is an arithmetic number, because the mean of its divisors is an integer number (36035949).

Almost surely, 2^72071897 is an apocalyptic number.

It is an amenable number.

72071897 is a deficient number, since it is larger than the sum of its proper divisors (1).

72071897 is an equidigital number, since it uses as much as digits as its factorization.

72071897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 72071897 is about 8489.5168884925. The cubic root of 72071897 is about 416.1551924205.

The spelling of 72071897 in words is "seventy-two million, seventy-one thousand, eight hundred ninety-seven".