72070517 has 2 divisors, whose sum is σ = 72070518. Its totient is φ = 72070516.

The previous prime is 72070507. The next prime is 72070519. The reversal of 72070517 is 71507027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72063121 + 7396 = 8489^2 + 86^2 .

It is an emirp because it is prime and its reverse (71507027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72070517 - 2¹⁶ = 72004981 is a prime.

Together with 72070519, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72070517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72070519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36035258 + 36035259.

It is an arithmetic number, because the mean of its divisors is an integer number (36035259).

Almost surely, 2^72070517 is an apocalyptic number.

It is an amenable number.

72070517 is a deficient number, since it is larger than the sum of its proper divisors (1).

72070517 is an equidigital number, since it uses as much as digits as its factorization.

72070517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 72070517 is about 8489.4356113937. The cubic root of 72070517 is about 416.1525362866.

The spelling of 72070517 in words is "seventy-two million, seventy thousand, five hundred seventeen".