72265621 has 2 divisors, whose sum is σ = 72265622. Its totient is φ = 72265620.

The previous prime is 72265579. The next prime is 72265643. The reversal of 72265621 is 12656227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72063121 + 202500 = 8489^2 + 450^2 .

It is an emirp because it is prime and its reverse (12656227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72265621 - 2²³ = 63877013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72265021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36132810 + 36132811.

It is an arithmetic number, because the mean of its divisors is an integer number (36132811).

Almost surely, 2^72265621 is an apocalyptic number.

It is an amenable number.

72265621 is a deficient number, since it is larger than the sum of its proper divisors (1).

72265621 is an equidigital number, since it uses as much as digits as its factorization.

72265621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 72265621 is about 8500.9188326910. The cubic root of 72265621 is about 416.5277237706.

The spelling of 72265621 in words is "seventy-two million, two hundred sixty-five thousand, six hundred twenty-one".