661434229 has 2 divisors, whose sum is σ = 661434230. Its totient is φ = 661434228.

The previous prime is 661434199. The next prime is 661434247. The reversal of 661434229 is 922434166.

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., 364733604 + 296700625 = 19098^2 + 17225^2 .

It is a cyclic number.

It is not a de Polignac number, because 661434229 - 2⁷ = 661434101 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661434029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330717114 + 330717115.

It is an arithmetic number, because the mean of its divisors is an integer number (330717115).

Almost surely, 2^661434229 is an apocalyptic number.

It is an amenable number.

661434229 is a deficient number, since it is larger than the sum of its proper divisors (1).

661434229 is an equidigital number, since it uses as much as digits as its factorization.

661434229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 37.

The square root of 661434229 is about 25718.3636532342. The cubic root of 661434229 is about 871.2889815531.

The spelling of 661434229 in words is "six hundred sixty-one million, four hundred thirty-four thousand, two hundred twenty-nine".