81477134 has 4 divisors (see below), whose sum is σ = 122215704. Its totient is φ = 40738566.

The previous prime is 81477133. The next prime is 81477163. The reversal of 81477134 is 43177418.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81477094 and 81477103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81477133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20369282 + ... + 20369285.

It is an arithmetic number, because the mean of its divisors is an integer number (30553926).

Almost surely, 2^81477134 is an apocalyptic number.

81477134 is a deficient number, since it is larger than the sum of its proper divisors (40738570).

81477134 is a wasteful number, since it uses less digits than its factorization.

81477134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40738569.

The product of its digits is 18816, while the sum is 35.

The square root of 81477134 is about 9026.4685231823. The cubic root of 81477134 is about 433.5227717413.

The spelling of 81477134 in words is "eighty-one million, four hundred seventy-seven thousand, one hundred thirty-four".