81245059 has 8 divisors (see below), whose sum is σ = 92907360. Its totient is φ = 69596736.

The previous prime is 81245051. The next prime is 81245077. The reversal of 81245059 is 95054218.

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 81245059 - 2³ = 81245051 is a prime.

It is a super-2 number, since 2×81245059² = 13201519223826962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81245051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16977 + ... + 21229.

It is an arithmetic number, because the mean of its divisors is an integer number (11613420).

Almost surely, 2^81245059 is an apocalyptic number.

81245059 is a deficient number, since it is larger than the sum of its proper divisors (11662301).

81245059 is a wasteful number, since it uses less digits than its factorization.

81245059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6989.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 81245059 is about 9013.6041071261. The cubic root of 81245059 is about 433.1107728260.

The spelling of 81245059 in words is "eighty-one million, two hundred forty-five thousand, fifty-nine".