1242928661 has 16 divisors (see below), whose sum is σ = 1387680000. Its totient is φ = 1105368768.

The previous prime is 1242928637. The next prime is 1242928691. The reversal of 1242928661 is 1668292421.

It is a cyclic number.

It is not a de Polignac number, because 1242928661 - 2⁶ = 1242928597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242928691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184820 + ... + 191426.

It is an arithmetic number, because the mean of its divisors is an integer number (86730000).

Almost surely, 2^1242928661 is an apocalyptic number.

It is an amenable number.

1242928661 is a deficient number, since it is larger than the sum of its proper divisors (144751339).

1242928661 is a wasteful number, since it uses less digits than its factorization.

1242928661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7148.

The product of its digits is 82944, while the sum is 41.

The square root of 1242928661 is about 35255.1933904779. The cubic root of 1242928661 is about 1075.1822041260.

The spelling of 1242928661 in words is "one billion, two hundred forty-two million, nine hundred twenty-eight thousand, six hundred sixty-one".