81503042 has 8 divisors (see below), whose sum is σ = 122547600. Its totient is φ = 40653844.

The previous prime is 81503041. The next prime is 81503047. The reversal of 81503042 is 24030518.

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

It is a junction number, because it is equal to n+sod(n) for n = 81502999 and 81503017.

It is not an unprimeable number, because it can be changed into a prime (81503041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47792 + ... + 49467.

It is an arithmetic number, because the mean of its divisors is an integer number (15318450).

Almost surely, 2^81503042 is an apocalyptic number.

81503042 is a deficient number, since it is larger than the sum of its proper divisors (41044558).

81503042 is a wasteful number, since it uses less digits than its factorization.

81503042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97680.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 81503042 is about 9027.9035218593. The cubic root of 81503042 is about 433.5687172197.

The spelling of 81503042 in words is "eighty-one million, five hundred three thousand, forty-two".