1216042425 has 72 divisors (see below), whose sum is σ = 2421456128. Its totient is φ = 579312000.

The previous prime is 1216042423. The next prime is 1216042433. The reversal of 1216042425 is 5242406121.

1216042425 is a `hidden beast` number, since 1 + 216 + 0 + 424 + 25 = 666.

It is not a de Polignac number, because 1216042425 - 2¹ = 1216042423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216042423) 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 71 ways as a sum of consecutive naturals, for example, 83970 + ... + 97380.

Almost surely, 2^1216042425 is an apocalyptic number.

1216042425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216042425 is a deficient number, since it is larger than the sum of its proper divisors (1205413703).

1216042425 is a wasteful number, since it uses less digits than its factorization.

1216042425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13471 (or 13463 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1216042425 is about 34871.7998531765. The cubic root of 1216042425 is about 1067.3730723861.

Adding to 1216042425 its reverse (5242406121), we get a palindrome (6458448546).

The spelling of 1216042425 in words is "one billion, two hundred sixteen million, forty-two thousand, four hundred twenty-five".