1521207116 has 24 divisors (see below), whose sum is σ = 3127517904. Its totient is φ = 638268480.

The previous prime is 1521207067. The next prime is 1521207119. The reversal of 1521207116 is 6117021251.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (1521207119) 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 7 ways as a sum of consecutive naturals, for example, 1329155 + ... + 1330298.

It is an arithmetic number, because the mean of its divisors is an integer number (130313246).

Almost surely, 2^1521207116 is an apocalyptic number.

It is an amenable number.

1521207116 is an abundant number, since it is smaller than the sum of its proper divisors (1606310788).

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

1521207116 is a wasteful number, since it uses less digits than its factorization.

1521207116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659481 (or 2659479 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 1521207116 is about 39002.6552429447. The cubic root of 1521207116 is about 1150.0837030442.

Adding to 1521207116 its reverse (6117021251), we get a palindrome (7638228367).

The spelling of 1521207116 in words is "one billion, five hundred twenty-one million, two hundred seven thousand, one hundred sixteen".