1216357629 has 16 divisors (see below), whose sum is σ = 1676351040. Its totient is φ = 784085760.

The previous prime is 1216357601. The next prime is 1216357631. The reversal of 1216357629 is 9267536121.

It is not a de Polignac number, because 1216357629 - 2⁹ = 1216357117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216357669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45532 + ... + 67125.

It is an arithmetic number, because the mean of its divisors is an integer number (104771940).

Almost surely, 2^1216357629 is an apocalyptic number.

It is an amenable number.

1216357629 is a deficient number, since it is larger than the sum of its proper divisors (459993411).

1216357629 is a wasteful number, since it uses less digits than its factorization.

1216357629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112780.

The product of its digits is 136080, while the sum is 42.

The square root of 1216357629 is about 34876.3190288195. The cubic root of 1216357629 is about 1067.4652871505.

The spelling of 1216357629 in words is "one billion, two hundred sixteen million, three hundred fifty-seven thousand, six hundred twenty-nine".