81125301835 has 32 divisors (see below), whose sum is σ = 99605721600. Its totient is φ = 63414731520.

The previous prime is 81125301827. The next prime is 81125301839. The reversal of 81125301835 is 53810352118.

It is a happy number.

It is not a de Polignac number, because 81125301835 - 2³ = 81125301827 is a prime.

It is a super-3 number, since 3×81125301835³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81125301794 and 81125301803.

It is not an unprimeable number, because it can be changed into a prime (81125301839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38833471 + ... + 38835559.

It is an arithmetic number, because the mean of its divisors is an integer number (3112678800).

Almost surely, 2^81125301835 is an apocalyptic number.

81125301835 is a deficient number, since it is larger than the sum of its proper divisors (18480419765).

81125301835 is a wasteful number, since it uses less digits than its factorization.

81125301835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 81125301835 in words is "eighty-one billion, one hundred twenty-five million, three hundred one thousand, eight hundred thirty-five".