1216958029 has 4 divisors (see below), whose sum is σ = 1390809184. Its totient is φ = 1043106876.

The previous prime is 1216958011. The next prime is 1216958089. The reversal of 1216958029 is 9208596121.

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 1216958029 - 2⁷ = 1216957901 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 (1216958089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86925567 + ... + 86925580.

It is an arithmetic number, because the mean of its divisors is an integer number (347702296).

Almost surely, 2^1216958029 is an apocalyptic number.

It is an amenable number.

1216958029 is a deficient number, since it is larger than the sum of its proper divisors (173851155).

1216958029 is an equidigital number, since it uses as much as digits as its factorization.

1216958029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173851154.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 1216958029 is about 34884.9255266512. The cubic root of 1216958029 is about 1067.6408936006.

The spelling of 1216958029 in words is "one billion, two hundred sixteen million, nine hundred fifty-eight thousand, twenty-nine".