1216515460 has 12 divisors (see below), whose sum is σ = 2554682508. Its totient is φ = 486606176.

The previous prime is 1216515439. The next prime is 1216515463. The reversal of 1216515460 is 645156121.

It can be written as a sum of positive squares in 2 ways, for example, as 795691264 + 420824196 = 28208^2 + 20514^2 .

It is not an unprimeable number, because it can be changed into a prime (1216515463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30412867 + ... + 30412906.

It is an arithmetic number, because the mean of its divisors is an integer number (212890209).

Almost surely, 2^1216515460 is an apocalyptic number.

1216515460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216515460 is an abundant number, since it is smaller than the sum of its proper divisors (1338167048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216515460 is a wasteful number, since it uses less digits than its factorization.

1216515460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60825782 (or 60825780 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1216515460 is about 34878.5816798791. The cubic root of 1216515460 is about 1067.5114555424.

The spelling of 1216515460 in words is "one billion, two hundred sixteen million, five hundred fifteen thousand, four hundred sixty".