81849148 has 12 divisors (see below), whose sum is σ = 143299800. Its totient is φ = 40906352.

The previous prime is 81849091. The next prime is 81849149. The reversal of 81849148 is 84194818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81849149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13503 + ... + 18601.

It is an arithmetic number, because the mean of its divisors is an integer number (11941650).

Almost surely, 2^81849148 is an apocalyptic number.

It is an amenable number.

81849148 is a deficient number, since it is larger than the sum of its proper divisors (61450652).

81849148 is a wasteful number, since it uses less digits than its factorization.

81849148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9116 (or 9114 counting only the distinct ones).

The product of its digits is 73728, while the sum is 43.

The square root of 81849148 is about 9047.0518955072. The cubic root of 81849148 is about 434.1815729589.

The spelling of 81849148 in words is "eighty-one million, eight hundred forty-nine thousand, one hundred forty-eight".