81502041 has 16 divisors (see below), whose sum is σ = 114408576. Its totient is φ = 51507456.

The previous prime is 81502033. The next prime is 81502049. The reversal of 81502041 is 14020518.

It is an interprime number because it is at equal distance from previous prime (81502033) and next prime (81502049).

It is not a de Polignac number, because 81502041 - 2³ = 81502033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81501999 and 81502017.

It is not an unprimeable number, because it can be changed into a prime (81502049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2571 + ... + 13023.

It is an arithmetic number, because the mean of its divisors is an integer number (7150536).

Almost surely, 2^81502041 is an apocalyptic number.

It is an amenable number.

81502041 is a deficient number, since it is larger than the sum of its proper divisors (32906535).

81502041 is a wasteful number, since it uses less digits than its factorization.

81502041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10592.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 81502041 is about 9027.8480824613. The cubic root of 81502041 is about 433.5669422183.

Adding to 81502041 its reverse (14020518), we get a palindrome (95522559).

The spelling of 81502041 in words is "eighty-one million, five hundred two thousand, forty-one".