81515038 has 24 divisors (see below), whose sum is σ = 135270576. Its totient is φ = 36812160.

The previous prime is 81514999. The next prime is 81515041. The reversal of 81515038 is 83051518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39406 + ... + 41422.

It is an arithmetic number, because the mean of its divisors is an integer number (5636274).

Almost surely, 2^81515038 is an apocalyptic number.

81515038 is a deficient number, since it is larger than the sum of its proper divisors (53755538).

81515038 is a wasteful number, since it uses less digits than its factorization.

81515038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208 (or 2197 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 81515038 is about 9028.5678820065. The cubic root of 81515038 is about 433.5899877353.

The spelling of 81515038 in words is "eighty-one million, five hundred fifteen thousand, thirty-eight".