72070291 has 2 divisors, whose sum is σ = 72070292. Its totient is φ = 72070290.

The previous prime is 72070289. The next prime is 72070309. The reversal of 72070291 is 19207027.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72070291 - 2¹ = 72070289 is a prime.

Together with 72070289, it forms a pair of twin primes.

It is equal to p_4232584 and since 72070291 and 4232584 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (72070241) 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, 36035145 + 36035146.

It is an arithmetic number, because the mean of its divisors is an integer number (36035146).

Almost surely, 2^72070291 is an apocalyptic number.

72070291 is a deficient number, since it is larger than the sum of its proper divisors (1).

72070291 is an equidigital number, since it uses as much as digits as its factorization.

72070291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 72070291 is about 8489.4223007222. The cubic root of 72070291 is about 416.1521012933.

It can be divided in two parts, 72070 and 291, that added together give a square (72361 = 269²).

The spelling of 72070291 in words is "seventy-two million, seventy thousand, two hundred ninety-one".