661142929 has 2 divisors, whose sum is σ = 661142930. Its totient is φ = 661142928.

The previous prime is 661142887. The next prime is 661142953. The reversal of 661142929 is 929241166.

661142929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437939329 + 223203600 = 20927^2 + 14940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661142929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661142891 and 661142900.

It is not a weakly prime, because it can be changed into another prime (661142959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330571464 + 330571465.

It is an arithmetic number, because the mean of its divisors is an integer number (330571465).

Almost surely, 2^661142929 is an apocalyptic number.

It is an amenable number.

661142929 is a deficient number, since it is larger than the sum of its proper divisors (1).

661142929 is an equidigital number, since it uses as much as digits as its factorization.

661142929 is an odious number, because the sum of its binary digits is odd.

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

The square root of 661142929 is about 25712.6997610130. The cubic root of 661142929 is about 871.1610556321.

The spelling of 661142929 in words is "six hundred sixty-one million, one hundred forty-two thousand, nine hundred twenty-nine".