72221441 has 2 divisors, whose sum is σ = 72221442. Its totient is φ = 72221440.

The previous prime is 72221431. The next prime is 72221473. The reversal of 72221441 is 14412227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42627841 + 29593600 = 6529^2 + 5440^2 .

It is a cyclic number.

It is not a de Polignac number, because 72221441 - 2¹⁴ = 72205057 is a prime.

It is not a weakly prime, because it can be changed into another prime (72221431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36110720 + 36110721.

It is an arithmetic number, because the mean of its divisors is an integer number (36110721).

Almost surely, 2^72221441 is an apocalyptic number.

It is an amenable number.

72221441 is a deficient number, since it is larger than the sum of its proper divisors (1).

72221441 is an equidigital number, since it uses as much as digits as its factorization.

72221441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 23.

The square root of 72221441 is about 8498.3198927788. The cubic root of 72221441 is about 416.4428242663.

Adding to 72221441 its reverse (14412227), we get a palindrome (86633668).

The spelling of 72221441 in words is "seventy-two million, two hundred twenty-one thousand, four hundred forty-one".