220831969 has 2 divisors, whose sum is σ = 220831970. Its totient is φ = 220831968.

The previous prime is 220831931. The next prime is 220831979. The reversal of 220831969 is 969138022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216442944 + 4389025 = 14712^2 + 2095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220831969 is a prime.

It is a super-2 number, since 2×220831969² = 97533517064833922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (220831909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110415984 + 110415985.

It is an arithmetic number, because the mean of its divisors is an integer number (110415985).

Almost surely, 2^220831969 is an apocalyptic number.

It is an amenable number.

220831969 is a deficient number, since it is larger than the sum of its proper divisors (1).

220831969 is an equidigital number, since it uses as much as digits as its factorization.

220831969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 220831969 is about 14860.4161785597. The cubic root of 220831969 is about 604.4410921007.

The spelling of 220831969 in words is "two hundred twenty million, eight hundred thirty-one thousand, nine hundred sixty-nine".