1089671221 has 2 divisors, whose sum is σ = 1089671222. Its totient is φ = 1089671220.

The previous prime is 1089671197. The next prime is 1089671251. The reversal of 1089671221 is 1221769801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 961868196 + 127803025 = 31014^2 + 11305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089671221 - 2⁵ = 1089671189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1089671251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544835610 + 544835611.

It is an arithmetic number, because the mean of its divisors is an integer number (544835611).

Almost surely, 2^1089671221 is an apocalyptic number.

It is an amenable number.

1089671221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089671221 is an equidigital number, since it uses as much as digits as its factorization.

1089671221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1089671221 is about 33010.1684485251. The cubic root of 1089671221 is about 1029.0389820281.

The spelling of 1089671221 in words is "one billion, eighty-nine million, six hundred seventy-one thousand, two hundred twenty-one".