81030502 has 16 divisors (see below), whose sum is σ = 140343840. Its totient is φ = 34368768.

The previous prime is 81030487. The next prime is 81030503. The reversal of 81030502 is 20503018.

81030502 = T₁₀₈ + T₁₀₉ + ... + T₇₈₆.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81030502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81030503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28477 + ... + 31192.

It is an arithmetic number, because the mean of its divisors is an integer number (8771490).

Almost surely, 2^81030502 is an apocalyptic number.

81030502 is a deficient number, since it is larger than the sum of its proper divisors (59313338).

81030502 is a wasteful number, since it uses less digits than its factorization.

81030502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59775.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 81030502 is about 9001.6943960568. The cubic root of 81030502 is about 432.7291747658.

The spelling of 81030502 in words is "eighty-one million, thirty thousand, five hundred two".