1242666791 has 16 divisors (see below), whose sum is σ = 1310515200. Its totient is φ = 1176588000.

The previous prime is 1242666769. The next prime is 1242666851. The reversal of 1242666791 is 1976662421.

It is a de Polignac number, because none of the positive numbers 2^k-1242666791 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 (1242666091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1079066 + ... + 1080216.

It is an arithmetic number, because the mean of its divisors is an integer number (81907200).

Almost surely, 2^1242666791 is an apocalyptic number.

1242666791 is a deficient number, since it is larger than the sum of its proper divisors (67848409).

1242666791 is a wasteful number, since it uses less digits than its factorization.

1242666791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870.

The product of its digits is 217728, while the sum is 44.

The square root of 1242666791 is about 35251.4792739255. The cubic root of 1242666791 is about 1075.1066895373.

The spelling of 1242666791 in words is "one billion, two hundred forty-two million, six hundred sixty-six thousand, seven hundred ninety-one".