1216737285 has 16 divisors (see below), whose sum is σ = 1957659840. Its totient is φ = 645299840.

The previous prime is 1216737281. The next prime is 1216737287. The reversal of 1216737285 is 5827376121.

It is not a de Polignac number, because 1216737285 - 2² = 1216737281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216737281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223896 + ... + 229265.

It is an arithmetic number, because the mean of its divisors is an integer number (122353740).

Almost surely, 2^1216737285 is an apocalyptic number.

1216737285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216737285 is a deficient number, since it is larger than the sum of its proper divisors (740922555).

1216737285 is a wasteful number, since it uses less digits than its factorization.

1216737285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453348.

The product of its digits is 141120, while the sum is 42.

The square root of 1216737285 is about 34881.7614950851. The cubic root of 1216737285 is about 1067.5763365748.

The spelling of 1216737285 in words is "one billion, two hundred sixteen million, seven hundred thirty-seven thousand, two hundred eighty-five".