1216344515 has 8 divisors (see below), whose sum is σ = 1474065648. Its totient is φ = 963440800.

The previous prime is 1216344511. The next prime is 1216344517. The reversal of 1216344515 is 5154436121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216344515 - 2² = 1216344511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216344511) 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, 1203797 + ... + 1204806.

It is an arithmetic number, because the mean of its divisors is an integer number (184258206).

Almost surely, 2^1216344515 is an apocalyptic number.

1216344515 is a deficient number, since it is larger than the sum of its proper divisors (257721133).

1216344515 is a wasteful number, since it uses less digits than its factorization.

1216344515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408709.

The product of its digits is 14400, while the sum is 32.

The square root of 1216344515 is about 34876.1310210866. The cubic root of 1216344515 is about 1067.4614508911.

The spelling of 1216344515 in words is "one billion, two hundred sixteen million, three hundred forty-four thousand, five hundred fifteen".