88665221 has 2 divisors, whose sum is σ = 88665222. Its totient is φ = 88665220.

The previous prime is 88665193. The next prime is 88665263. The reversal of 88665221 is 12256688.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81450625 + 7214596 = 9025^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 88665221 - 2¹⁴ = 88648837 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88662221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44332610 + 44332611.

It is an arithmetic number, because the mean of its divisors is an integer number (44332611).

Almost surely, 2^88665221 is an apocalyptic number.

It is an amenable number.

88665221 is a deficient number, since it is larger than the sum of its proper divisors (1).

88665221 is an equidigital number, since it uses as much as digits as its factorization.

88665221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 38.

The square root of 88665221 is about 9416.2211635029. The cubic root of 88665221 is about 445.9139923435.

The spelling of 88665221 in words is "eighty-eight million, six hundred sixty-five thousand, two hundred twenty-one".