81313055 has 8 divisors (see below), whose sum is σ = 99652032. Its totient is φ = 63666208.

The previous prime is 81313007. The next prime is 81313081. The reversal of 81313055 is 55031318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81313055 - 2¹⁰ = 81312031 is a prime.

It is a super-2 number, since 2×81313055² = 13223625826866050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172772 + ... + 173241.

It is an arithmetic number, because the mean of its divisors is an integer number (12456504).

Almost surely, 2^81313055 is an apocalyptic number.

81313055 is a deficient number, since it is larger than the sum of its proper divisors (18338977).

81313055 is a wasteful number, since it uses less digits than its factorization.

81313055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346065.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 81313055 is about 9017.3751724102. The cubic root of 81313055 is about 433.2315661745.

The spelling of 81313055 in words is "eighty-one million, three hundred thirteen thousand, fifty-five".