1216955097 has 10 divisors (see below), whose sum is σ = 1817920698. Its totient is φ = 811303344.

The previous prime is 1216955087. The next prime is 1216955099. The reversal of 1216955097 is 7905596121.

1216955097 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 9 + 550 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 873557136 + 343397961 = 29556^2 + 18531^2 .

It is not a de Polignac number, because 1216955097 - 2⁸ = 1216954841 is a prime.

It is a super-2 number, since 2×1216955097² = 2961959416228558818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1216955099) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7511988 + ... + 7512149.

Almost surely, 2^1216955097 is an apocalyptic number.

It is an amenable number.

1216955097 is a deficient number, since it is larger than the sum of its proper divisors (600965601).

1216955097 is an equidigital number, since it uses as much as digits as its factorization.

1216955097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15024149 (or 15024140 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 45.

The square root of 1216955097 is about 34884.8835027437. The cubic root of 1216955097 is about 1067.6400361824.

The spelling of 1216955097 in words is "one billion, two hundred sixteen million, nine hundred fifty-five thousand, ninety-seven".