611728669 has 2 divisors, whose sum is σ = 611728670. Its totient is φ = 611728668.

The previous prime is 611728643. The next prime is 611728721. The reversal of 611728669 is 966827116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360506169 + 251222500 = 18987^2 + 15850^2 .

It is a cyclic number.

It is not a de Polignac number, because 611728669 - 2¹³ = 611720477 is a prime.

It is a super-2 number, since 2×611728669² = 748423928953023122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611728609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305864334 + 305864335.

It is an arithmetic number, because the mean of its divisors is an integer number (305864335).

Almost surely, 2^611728669 is an apocalyptic number.

It is an amenable number.

611728669 is a deficient number, since it is larger than the sum of its proper divisors (1).

611728669 is an equidigital number, since it uses as much as digits as its factorization.

611728669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 611728669 is about 24733.1491929354. The cubic root of 611728669 is about 848.8929851802.

The spelling of 611728669 in words is "six hundred eleven million, seven hundred twenty-eight thousand, six hundred sixty-nine".