1243661129 has 8 divisors (see below), whose sum is σ = 1374071040. Its totient is φ = 1119612736.

The previous prime is 1243661119. The next prime is 1243661141. The reversal of 1243661129 is 9211663421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243661129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1243661119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589969 + ... + 1590750.

It is an arithmetic number, because the mean of its divisors is an integer number (171758880).

Almost surely, 2^1243661129 is an apocalyptic number.

It is an amenable number.

1243661129 is a deficient number, since it is larger than the sum of its proper divisors (130409911).

1243661129 is a wasteful number, since it uses less digits than its factorization.

1243661129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180759.

The product of its digits is 15552, while the sum is 35.

The square root of 1243661129 is about 35265.5799470248. The cubic root of 1243661129 is about 1075.3933671995.

The spelling of 1243661129 in words is "one billion, two hundred forty-three million, six hundred sixty-one thousand, one hundred twenty-nine".