1268216737 has 4 divisors (see below), whose sum is σ = 1268347696. Its totient is φ = 1268085780.

The previous prime is 1268216723. The next prime is 1268216743. The reversal of 1268216737 is 7376128621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268216737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1268216693 and 1268216702.

It is not an unprimeable number, because it can be changed into a prime (1268216717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49683 + ... + 70744.

It is an arithmetic number, because the mean of its divisors is an integer number (317086924).

Almost surely, 2^1268216737 is an apocalyptic number.

It is an amenable number.

1268216737 is a deficient number, since it is larger than the sum of its proper divisors (130959).

1268216737 is a wasteful number, since it uses less digits than its factorization.

1268216737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130958.

The product of its digits is 169344, while the sum is 43.

The square root of 1268216737 is about 35612.0307901698. The cubic root of 1268216737 is about 1082.4250311569.

The spelling of 1268216737 in words is "one billion, two hundred sixty-eight million, two hundred sixteen thousand, seven hundred thirty-seven".