1216691693 has 8 divisors (see below), whose sum is σ = 1398832512. Its totient is φ = 1036632816.

The previous prime is 1216691639. The next prime is 1216691701. The reversal of 1216691693 is 3961966121.

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 1216691693 - 2¹⁶ = 1216626157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216691293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519230 + ... + 521567.

It is an arithmetic number, because the mean of its divisors is an integer number (174854064).

Almost surely, 2^1216691693 is an apocalyptic number.

It is an amenable number.

1216691693 is a deficient number, since it is larger than the sum of its proper divisors (182140819).

1216691693 is a wasteful number, since it uses less digits than its factorization.

1216691693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040971.

The product of its digits is 104976, while the sum is 44.

The square root of 1216691693 is about 34881.1079669210. The cubic root of 1216691693 is about 1067.5630021300.

The spelling of 1216691693 in words is "one billion, two hundred sixteen million, six hundred ninety-one thousand, six hundred ninety-three".