964161221 has 2 divisors, whose sum is σ = 964161222. Its totient is φ = 964161220.

The previous prime is 964161203. The next prime is 964161227. The reversal of 964161221 is 122161469.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 770673121 + 193488100 = 27761^2 + 13910^2 .

It is a cyclic number.

It is not a de Polignac number, because 964161221 - 2⁶ = 964161157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (964161227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 482080610 + 482080611.

It is an arithmetic number, because the mean of its divisors is an integer number (482080611).

Almost surely, 2^964161221 is an apocalyptic number.

It is an amenable number.

964161221 is a deficient number, since it is larger than the sum of its proper divisors (1).

964161221 is an equidigital number, since it uses as much as digits as its factorization.

964161221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 964161221 is about 31050.9455733638. The cubic root of 964161221 is about 987.9081160077.

The spelling of 964161221 in words is "nine hundred sixty-four million, one hundred sixty-one thousand, two hundred twenty-one".