81932534 has 4 divisors (see below), whose sum is σ = 122898804. Its totient is φ = 40966266.

The previous prime is 81932519. The next prime is 81932549. The reversal of 81932534 is 43523918.

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

It is an interprime number because it is at equal distance from previous prime (81932519) and next prime (81932549).

It is a super-2 number, since 2×81932534² = 13425880255322312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81932494 and 81932503.

It is a congruent number.

It is an unprimeable number.

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, 20483132 + ... + 20483135.

It is an arithmetic number, because the mean of its divisors is an integer number (30724701).

Almost surely, 2^81932534 is an apocalyptic number.

81932534 is a deficient number, since it is larger than the sum of its proper divisors (40966270).

81932534 is a wasteful number, since it uses less digits than its factorization.

81932534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40966269.

The product of its digits is 25920, while the sum is 35.

The square root of 81932534 is about 9051.6591849229. The cubic root of 81932534 is about 434.3289675975.

The spelling of 81932534 in words is "eighty-one million, nine hundred thirty-two thousand, five hundred thirty-four".