81502294 has 16 divisors (see below), whose sum is σ = 127880928. Its totient is φ = 38884032.

The previous prime is 81502273. The next prime is 81502297. The reversal of 81502294 is 49220518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81502297) 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 7 ways as a sum of consecutive naturals, for example, 19084 + ... + 22960.

It is an arithmetic number, because the mean of its divisors is an integer number (7992558).

Almost surely, 2^81502294 is an apocalyptic number.

81502294 is a deficient number, since it is larger than the sum of its proper divisors (46378634).

81502294 is a wasteful number, since it uses less digits than its factorization.

81502294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4359.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 81502294 is about 9027.8620946490. The cubic root of 81502294 is about 433.5673908464.

It can be divided in two parts, 81502 and 294, that added together give a square (81796 = 286²).

The spelling of 81502294 in words is "eighty-one million, five hundred two thousand, two hundred ninety-four".