1216354625 has 16 divisors (see below), whose sum is σ = 1536312960. Its totient is φ = 961351600.

The previous prime is 1216354619. The next prime is 1216354639. The reversal of 1216354625 is 5264536121.

It is not a de Polignac number, because 1216354625 - 2¹⁴ = 1216338241 is a prime.

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, 48245 + ... + 68994.

It is an arithmetic number, because the mean of its divisors is an integer number (96019560).

Almost surely, 2^1216354625 is an apocalyptic number.

It is an amenable number.

1216354625 is a deficient number, since it is larger than the sum of its proper divisors (319958335).

1216354625 is an equidigital number, since it uses as much as digits as its factorization.

1216354625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117337 (or 117327 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 1216354625 is about 34876.2759623214. The cubic root of 1216354625 is about 1067.4644083880.

The spelling of 1216354625 in words is "one billion, two hundred sixteen million, three hundred fifty-four thousand, six hundred twenty-five".