81523346 has 4 divisors (see below), whose sum is σ = 122285022. Its totient is φ = 40761672.

The previous prime is 81523297. The next prime is 81523369. The reversal of 81523346 is 64332518.

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., 64176121 + 17347225 = 8011^2 + 4165^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20380835 + ... + 20380838.

Almost surely, 2^81523346 is an apocalyptic number.

81523346 is a deficient number, since it is larger than the sum of its proper divisors (40761676).

81523346 is a wasteful number, since it uses less digits than its factorization.

81523346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40761675.

The product of its digits is 17280, while the sum is 32.

The square root of 81523346 is about 9029.0279654014. The cubic root of 81523346 is about 433.6047177096.

The spelling of 81523346 in words is "eighty-one million, five hundred twenty-three thousand, three hundred forty-six".