1216313425 has 12 divisors (see below), whose sum is σ = 1529473536. Its totient is φ = 959344400.

The previous prime is 1216313419. The next prime is 1216313429. The reversal of 1216313425 is 5243136121.

It is not a de Polignac number, because 1216313425 - 2⁹ = 1216312913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216313393 and 1216313402.

It is not an unprimeable number, because it can be changed into a prime (1216313429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340849 + ... + 344398.

It is an arithmetic number, because the mean of its divisors is an integer number (127456128).

Almost surely, 2^1216313425 is an apocalyptic number.

It is an amenable number.

1216313425 is a deficient number, since it is larger than the sum of its proper divisors (313160111).

1216313425 is an equidigital number, since it uses as much as digits as its factorization.

1216313425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685328 (or 685323 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 1216313425 is about 34875.6852979264. The cubic root of 1216313425 is about 1067.4523559735.

Adding to 1216313425 its reverse (5243136121), we get a palindrome (6459449546).

The spelling of 1216313425 in words is "one billion, two hundred sixteen million, three hundred thirteen thousand, four hundred twenty-five".