81515102 has 8 divisors (see below), whose sum is σ = 129465216. Its totient is φ = 38360032.

The previous prime is 81515053. The next prime is 81515129. The reversal of 81515102 is 20151518.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1198718 + ... + 1198785.

It is an arithmetic number, because the mean of its divisors is an integer number (16183152).

Almost surely, 2^81515102 is an apocalyptic number.

81515102 is a deficient number, since it is larger than the sum of its proper divisors (47950114).

81515102 is a wasteful number, since it uses less digits than its factorization.

81515102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2397522.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 81515102 is about 9028.5714263110. The cubic root of 81515102 is about 433.5901012103.

The spelling of 81515102 in words is "eighty-one million, five hundred fifteen thousand, one hundred two".