72049391 has 2 divisors, whose sum is σ = 72049392. Its totient is φ = 72049390.

The previous prime is 72049379. The next prime is 72049421. The reversal of 72049391 is 19394027.

It is a weak prime.

It is an emirp because it is prime and its reverse (19394027) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72049391 is a prime.

It is a super-2 number, since 2×72049391² = 10382229486941762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72049331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36024695 + 36024696.

It is an arithmetic number, because the mean of its divisors is an integer number (36024696).

Almost surely, 2^72049391 is an apocalyptic number.

72049391 is a deficient number, since it is larger than the sum of its proper divisors (1).

72049391 is an equidigital number, since it uses as much as digits as its factorization.

72049391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 72049391 is about 8488.1912678733. The cubic root of 72049391 is about 416.1118701075. Note that the first 3 decimals are identical.

The spelling of 72049391 in words is "seventy-two million, forty-nine thousand, three hundred ninety-one".