1216653129 has 24 divisors (see below), whose sum is σ = 1871746240. Its totient is φ = 789174576.

The previous prime is 1216653083. The next prime is 1216653133. The reversal of 1216653129 is 9213566121.

It is not a de Polignac number, because 1216653129 - 2²³ = 1208264521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1216653093 and 1216653102.

It is not an unprimeable number, because it can be changed into a prime (1216653169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58669 + ... + 76650.

Almost surely, 2^1216653129 is an apocalyptic number.

It is an amenable number.

1216653129 is a deficient number, since it is larger than the sum of its proper divisors (655093111).

1216653129 is an equidigital number, since it uses as much as digits as its factorization.

1216653129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135371 (or 135359 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 1216653129 is about 34880.5551704671. Note that the first 3 decimals coincide. The cubic root of 1216653129 is about 1067.5517229279.

The spelling of 1216653129 in words is "one billion, two hundred sixteen million, six hundred fifty-three thousand, one hundred twenty-nine".