1651538915 has 16 divisors (see below), whose sum is σ = 2170476000. Its totient is φ = 1198924032.

The previous prime is 1651538887. The next prime is 1651538921. The reversal of 1651538915 is 5198351561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1651538915 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 211490 + ... + 219159.

It is an arithmetic number, because the mean of its divisors is an integer number (135654750).

Almost surely, 2^1651538915 is an apocalyptic number.

1651538915 is a deficient number, since it is larger than the sum of its proper divisors (518937085).

1651538915 is a wasteful number, since it uses less digits than its factorization.

1651538915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430726.

The product of its digits is 162000, while the sum is 44.

The square root of 1651538915 is about 40639.1303425652. The cubic root of 1651538915 is about 1182.0330066472.

The spelling of 1651538915 in words is "one billion, six hundred fifty-one million, five hundred thirty-eight thousand, nine hundred fifteen".