1216257767 has 8 divisors (see below), whose sum is σ = 1276978800. Its totient is φ = 1156788864.

The previous prime is 1216257719. The next prime is 1216257769. The reversal of 1216257767 is 7677526121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216257767 - 2⁶ = 1216257703 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 (1216257769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311042 + ... + 314927.

It is an arithmetic number, because the mean of its divisors is an integer number (159622350).

Almost surely, 2^1216257767 is an apocalyptic number.

1216257767 is a deficient number, since it is larger than the sum of its proper divisors (60721033).

1216257767 is an equidigital number, since it uses as much as digits as its factorization.

1216257767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626065.

The product of its digits is 246960, while the sum is 44.

The square root of 1216257767 is about 34874.8873403198. The cubic root of 1216257767 is about 1067.4360736655.

The spelling of 1216257767 in words is "one billion, two hundred sixteen million, two hundred fifty-seven thousand, seven hundred sixty-seven".