788161221 has 12 divisors (see below), whose sum is σ = 1142050572. Its totient is φ = 523781376.

The previous prime is 788161219. The next prime is 788161223. The reversal of 788161221 is 122161887.

It is an interprime number because it is at equal distance from previous prime (788161219) and next prime (788161223).

It can be written as a sum of positive squares in 2 ways, for example, as 426629025 + 361532196 = 20655^2 + 19014^2 .

It is not a de Polignac number, because 788161221 - 2¹ = 788161219 is a prime.

It is a super-2 number, since 2×788161221² = 1242396220576421682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (788161223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135276 + ... + 140981.

It is an arithmetic number, because the mean of its divisors is an integer number (95170881).

Almost surely, 2^788161221 is an apocalyptic number.

It is an amenable number.

788161221 is a deficient number, since it is larger than the sum of its proper divisors (353889351).

788161221 is a wasteful number, since it uses less digits than its factorization.

788161221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276580 (or 276577 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 788161221 is about 28074.2091785325. The cubic root of 788161221 is about 923.7157619288.

The spelling of 788161221 in words is "seven hundred eighty-eight million, one hundred sixty-one thousand, two hundred twenty-one".