1229072661 has 12 divisors (see below), whose sum is σ = 1779967488. Its totient is φ = 817240104.

The previous prime is 1229072657. The next prime is 1229072683. The reversal of 1229072661 is 1662709221.

It is not a de Polignac number, because 1229072661 - 2² = 1229072657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229072641) 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 11 ways as a sum of consecutive naturals, for example, 174835 + ... + 181728.

It is an arithmetic number, because the mean of its divisors is an integer number (148330624).

Almost surely, 2^1229072661 is an apocalyptic number.

It is an amenable number.

1229072661 is a deficient number, since it is larger than the sum of its proper divisors (550894827).

1229072661 is a wasteful number, since it uses less digits than its factorization.

1229072661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356952 (or 356949 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1229072661 is about 35058.1325943068. The cubic root of 1229072661 is about 1071.1719366066.

The spelling of 1229072661 in words is "one billion, two hundred twenty-nine million, seventy-two thousand, six hundred sixty-one".