1521551216 has 20 divisors (see below), whose sum is σ = 3016565112. Its totient is φ = 743082816.

The previous prime is 1521551203. The next prime is 1521551231. The reversal of 1521551216 is 6121551251.

It is a super-2 number, since 2×1521551216² = 4630236205822157312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1105091 + ... + 1106466.

Almost surely, 2^1521551216 is an apocalyptic number.

1521551216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1521551216 is a deficient number, since it is larger than the sum of its proper divisors (1495013896).

1521551216 is a wasteful number, since it uses less digits than its factorization.

1521551216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211608 (or 2211602 counting only the distinct ones).

The product of its digits is 3000, while the sum is 29.

The square root of 1521551216 is about 39007.0662316458. The cubic root of 1521551216 is about 1150.1704135613.

The spelling of 1521551216 in words is "one billion, five hundred twenty-one million, five hundred fifty-one thousand, two hundred sixteen".