1216098993 has 4 divisors (see below), whose sum is σ = 1621465328. Its totient is φ = 810732660.

The previous prime is 1216098967. The next prime is 1216099013. The reversal of 1216098993 is 3998906121.

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 not a de Polignac number, because 1216098993 - 2¹² = 1216094897 is a prime.

It is a super-2 number, since 2×1216098993² = 2957793521551228098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216098193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202683163 + ... + 202683168.

It is an arithmetic number, because the mean of its divisors is an integer number (405366332).

Almost surely, 2^1216098993 is an apocalyptic number.

It is an amenable number.

1216098993 is a deficient number, since it is larger than the sum of its proper divisors (405366335).

1216098993 is an equidigital number, since it uses as much as digits as its factorization.

1216098993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405366334.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 1216098993 is about 34872.6109289224. The cubic root of 1216098993 is about 1067.3896228568.

The spelling of 1216098993 in words is "one billion, two hundred sixteen million, ninety-eight thousand, nine hundred ninety-three".