72051643 has 2 divisors, whose sum is σ = 72051644. Its totient is φ = 72051642.

The previous prime is 72051619. The next prime is 72051671. The reversal of 72051643 is 34615027.

It is an a-pointer prime, because the next prime (72051671) can be obtained adding 72051643 to its sum of digits (28).

It is a weak prime.

It is an emirp because it is prime and its reverse (34615027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72051643 - 2⁹ = 72051131 is a prime.

It is not a weakly prime, because it can be changed into another prime (72051043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36025821 + 36025822.

It is an arithmetic number, because the mean of its divisors is an integer number (36025822).

Almost surely, 2^72051643 is an apocalyptic number.

72051643 is a deficient number, since it is larger than the sum of its proper divisors (1).

72051643 is an equidigital number, since it uses as much as digits as its factorization.

72051643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 72051643 is about 8488.3239217174. The cubic root of 72051643 is about 416.1162054399.

The spelling of 72051643 in words is "seventy-two million, fifty-one thousand, six hundred forty-three".