81369148 has 24 divisors (see below), whose sum is σ = 162936704. Its totient is φ = 34830000.

The previous prime is 81369139. The next prime is 81369149. The reversal of 81369148 is 84196318.

It is a self number, because there is not a number n which added to its sum of digits gives 81369148.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81369149) 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, 35023 + ... + 37273.

Almost surely, 2^81369148 is an apocalyptic number.

It is an amenable number.

81369148 is an abundant number, since it is smaller than the sum of its proper divisors (81567556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81369148 is a wasteful number, since it uses less digits than its factorization.

81369148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553 (or 3551 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 81369148 is about 9020.4849093605. The cubic root of 81369148 is about 433.3311634342.

The spelling of 81369148 in words is "eighty-one million, three hundred sixty-nine thousand, one hundred forty-eight".