81353606 has 4 divisors (see below), whose sum is σ = 122030412. Its totient is φ = 40676802.

The previous prime is 81353603. The next prime is 81353617. The reversal of 81353606 is 60635318.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81353603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20338400 + ... + 20338403.

It is an arithmetic number, because the mean of its divisors is an integer number (30507603).

Almost surely, 2^81353606 is an apocalyptic number.

81353606 is a deficient number, since it is larger than the sum of its proper divisors (40676806).

81353606 is a wasteful number, since it uses less digits than its factorization.

81353606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40676805.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 81353606 is about 9019.6233845987. The cubic root of 81353606 is about 433.3035720520.

The spelling of 81353606 in words is "eighty-one million, three hundred fifty-three thousand, six hundred six".