1535221516 has 24 divisors (see below), whose sum is σ = 2849348880. Its totient is φ = 721270272.

The previous prime is 1535221487. The next prime is 1535221529. The reversal of 1535221516 is 6151225351.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23856 + ... + 60328.

It is an arithmetic number, because the mean of its divisors is an integer number (118722870).

Almost surely, 2^1535221516 is an apocalyptic number.

It is an amenable number.

1535221516 is a deficient number, since it is larger than the sum of its proper divisors (1314127364).

1535221516 is a wasteful number, since it uses less digits than its factorization.

1535221516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37113 (or 37111 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 1535221516 is about 39181.9029144834. The cubic root of 1535221516 is about 1153.6046982684.

Adding to 1535221516 its reverse (6151225351), we get a palindrome (7686446867).

The spelling of 1535221516 in words is "one billion, five hundred thirty-five million, two hundred twenty-one thousand, five hundred sixteen".