81080251 has 12 divisors (see below), whose sum is σ = 95729448. Its totient is φ = 68457312.

The previous prime is 81080231. The next prime is 81080273. The reversal of 81080251 is 15208018.

It is not a de Polignac number, because 81080251 - 2¹¹ = 81078203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81080231) 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 11 ways as a sum of consecutive naturals, for example, 9066 + ... + 15631.

It is an arithmetic number, because the mean of its divisors is an integer number (7977454).

Almost surely, 2^81080251 is an apocalyptic number.

81080251 is a deficient number, since it is larger than the sum of its proper divisors (14649197).

81080251 is a wasteful number, since it uses less digits than its factorization.

81080251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24778 (or 24771 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 81080251 is about 9004.4572851450. The cubic root of 81080251 is about 432.8177152495.

Adding to 81080251 its reverse (15208018), we get a palindrome (96288269).

The spelling of 81080251 in words is "eighty-one million, eighty thousand, two hundred fifty-one".