81149398 has 32 divisors (see below), whose sum is σ = 142946208. Its totient is φ = 34137600.

The previous prime is 81149389. The next prime is 81149417. The reversal of 81149398 is 89394118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21036 + ... + 24592.

It is an arithmetic number, because the mean of its divisors is an integer number (4467069).

Almost surely, 2^81149398 is an apocalyptic number.

81149398 is a deficient number, since it is larger than the sum of its proper divisors (61796810).

81149398 is a wasteful number, since it uses less digits than its factorization.

81149398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648.

The product of its digits is 62208, while the sum is 43.

The square root of 81149398 is about 9008.2960652945. The cubic root of 81149398 is about 432.9407190737.

The spelling of 81149398 in words is "eighty-one million, one hundred forty-nine thousand, three hundred ninety-eight".