87221269 has 2 divisors, whose sum is σ = 87221270. Its totient is φ = 87221268.

The previous prime is 87221231. The next prime is 87221273. The reversal of 87221269 is 96212278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44488900 + 42732369 = 6670^2 + 6537^2 .

It is a cyclic number.

It is not a de Polignac number, because 87221269 - 2¹¹ = 87219221 is a prime.

It is a super-2 number, since 2×87221269² = 15215099531940722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87221279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43610634 + 43610635.

It is an arithmetic number, because the mean of its divisors is an integer number (43610635).

Almost surely, 2^87221269 is an apocalyptic number.

It is an amenable number.

87221269 is a deficient number, since it is larger than the sum of its proper divisors (1).

87221269 is an equidigital number, since it uses as much as digits as its factorization.

87221269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 87221269 is about 9339.2327843351. The cubic root of 87221269 is about 443.4800968229.

The spelling of 87221269 in words is "eighty-seven million, two hundred twenty-one thousand, two hundred sixty-nine".