1216007155 has 8 divisors (see below), whose sum is σ = 1591863984. Its totient is φ = 884368800.

The previous prime is 1216007129. The next prime is 1216007159. The reversal of 1216007155 is 5517006121.

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

It is not a de Polignac number, because 1216007155 - 2⁹ = 1216006643 is a prime.

It is a super-2 number, since 2×1216007155² = 2957346802022388050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216007159) 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, 11054556 + ... + 11054665.

It is an arithmetic number, because the mean of its divisors is an integer number (198982998).

Almost surely, 2^1216007155 is an apocalyptic number.

1216007155 is a deficient number, since it is larger than the sum of its proper divisors (375856829).

1216007155 is a wasteful number, since it uses less digits than its factorization.

1216007155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22109237.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 1216007155 is about 34871.2941400230. The cubic root of 1216007155 is about 1067.3627529511.

The spelling of 1216007155 in words is "one billion, two hundred sixteen million, seven thousand, one hundred fifty-five".