81465754 has 4 divisors (see below), whose sum is σ = 122198634. Its totient is φ = 40732876.

The previous prime is 81465739. The next prime is 81465757. The reversal of 81465754 is 45756418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 81450625 + 15129 = 9025^2 + 123^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81465757) 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 as a sum of consecutive naturals, namely, 20366437 + ... + 20366440.

Almost surely, 2^81465754 is an apocalyptic number.

81465754 is a deficient number, since it is larger than the sum of its proper divisors (40732880).

81465754 is a wasteful number, since it uses less digits than its factorization.

81465754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40732879.

The product of its digits is 134400, while the sum is 40.

The square root of 81465754 is about 9025.8381328273. The cubic root of 81465754 is about 433.5025872691.

The spelling of 81465754 in words is "eighty-one million, four hundred sixty-five thousand, seven hundred fifty-four".