1216245201 has 16 divisors (see below), whose sum is σ = 1634951424. Its totient is φ = 804205584.

The previous prime is 1216245169. The next prime is 1216245209. The reversal of 1216245201 is 1025426121.

It is not a de Polignac number, because 1216245201 - 2⁵ = 1216245169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216245209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265210 + ... + 269756.

It is an arithmetic number, because the mean of its divisors is an integer number (102184464).

Almost surely, 2^1216245201 is an apocalyptic number.

It is an amenable number.

1216245201 is a deficient number, since it is larger than the sum of its proper divisors (418706223).

1216245201 is a wasteful number, since it uses less digits than its factorization.

1216245201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5260.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1216245201 is about 34874.7071815664. The cubic root of 1216245201 is about 1067.4323975128.

The spelling of 1216245201 in words is "one billion, two hundred sixteen million, two hundred forty-five thousand, two hundred one".