1216415005 has 16 divisors (see below), whose sum is σ = 1626191280. Its totient is φ = 867299328.

The previous prime is 1216414963. The next prime is 1216415021. The reversal of 1216415005 is 5005146121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 391921209 + 824493796 = 19797^2 + 28714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216415005 - 2¹³ = 1216406813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320772 + ... + 324541.

It is an arithmetic number, because the mean of its divisors is an integer number (101636955).

Almost surely, 2^1216415005 is an apocalyptic number.

It is an amenable number.

1216415005 is a deficient number, since it is larger than the sum of its proper divisors (409776275).

1216415005 is a wasteful number, since it uses less digits than its factorization.

1216415005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645360.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1216415005 is about 34877.1415829910. The cubic root of 1216415005 is about 1067.4820711192.

The spelling of 1216415005 in words is "one billion, two hundred sixteen million, four hundred fifteen thousand, five".