72221269 has 2 divisors, whose sum is σ = 72221270. Its totient is φ = 72221268.

The previous prime is 72221257. The next prime is 72221273. The reversal of 72221269 is 96212227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42081169 + 30140100 = 6487^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 72221269 - 2⁷ = 72221141 is a prime.

It is a super-2 number, since 2×72221269² = 10431823391940722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72221269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72221239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36110634 + 36110635.

It is an arithmetic number, because the mean of its divisors is an integer number (36110635).

Almost surely, 2^72221269 is an apocalyptic number.

It is an amenable number.

72221269 is a deficient number, since it is larger than the sum of its proper divisors (1).

72221269 is an equidigital number, since it uses as much as digits as its factorization.

72221269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 72221269 is about 8498.3097731255. The cubic root of 72221269 is about 416.4424936709.

The spelling of 72221269 in words is "seventy-two million, two hundred twenty-one thousand, two hundred sixty-nine".