1216695025 has 24 divisors (see below), whose sum is σ = 1856867264. Its totient is φ = 770126400.

The previous prime is 1216695017. The next prime is 1216695061. The reversal of 1216695025 is 5205966121.

It is not a de Polignac number, because 1216695025 - 2³ = 1216695017 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265131 + ... + 269680.

Almost surely, 2^1216695025 is an apocalyptic number.

It is an amenable number.

1216695025 is a deficient number, since it is larger than the sum of its proper divisors (640172239).

1216695025 is a wasteful number, since it uses less digits than its factorization.

1216695025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534841 (or 534836 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1216695025 is about 34881.1557291326. The cubic root of 1216695025 is about 1067.5639766625.

The spelling of 1216695025 in words is "one billion, two hundred sixteen million, six hundred ninety-five thousand, twenty-five".