1281215016 has 64 divisors (see below), whose sum is σ = 3578702400. Its totient is φ = 424699200.

The previous prime is 1281215003. The next prime is 1281215051. The reversal of 1281215016 is 6105121821.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22711 + ... + 55481.

It is an arithmetic number, because the mean of its divisors is an integer number (55917225).

Almost surely, 2^1281215016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281215016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1789351200).

1281215016 is an abundant number, since it is smaller than the sum of its proper divisors (2297487384).

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

1281215016 is a wasteful number, since it uses less digits than its factorization.

1281215016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32967 (or 32957 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1281215016 is about 35794.0639771457. The cubic root of 1281215016 is about 1086.1104859967.

Adding to 1281215016 its reverse (6105121821), we get a palindrome (7386336837).

The spelling of 1281215016 in words is "one billion, two hundred eighty-one million, two hundred fifteen thousand, sixteen".