72218651 has 2 divisors, whose sum is σ = 72218652. Its totient is φ = 72218650.

The previous prime is 72218647. The next prime is 72218659. The reversal of 72218651 is 15681227.

It is a weak prime.

It is an emirp because it is prime and its reverse (15681227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72218651 - 2² = 72218647 is a prime.

It is not a weakly prime, because it can be changed into another prime (72218659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36109325 + 36109326.

It is an arithmetic number, because the mean of its divisors is an integer number (36109326).

Almost surely, 2^72218651 is an apocalyptic number.

72218651 is a deficient number, since it is larger than the sum of its proper divisors (1).

72218651 is an equidigital number, since it uses as much as digits as its factorization.

72218651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 72218651 is about 8498.1557411005. The cubic root of 72218651 is about 416.4374616370.

Adding to 72218651 its reverse (15681227), we get a palindrome (87899878).

The spelling of 72218651 in words is "seventy-two million, two hundred eighteen thousand, six hundred fifty-one".