81225123 has 16 divisors (see below), whose sum is σ = 125871360. Its totient is φ = 45626976.

The previous prime is 81225113. The next prime is 81225163. The reversal of 81225123 is 32152218.

It is not a de Polignac number, because 81225123 - 2¹⁴ = 81208739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81225093 and 81225102.

It is not an unprimeable number, because it can be changed into a prime (81225113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31540 + ... + 34017.

It is an arithmetic number, because the mean of its divisors is an integer number (7866960).

Almost surely, 2^81225123 is an apocalyptic number.

81225123 is a deficient number, since it is larger than the sum of its proper divisors (44646237).

81225123 is a wasteful number, since it uses less digits than its factorization.

81225123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65626.

The product of its digits is 960, while the sum is 24.

The square root of 81225123 is about 9012.4981553396. The cubic root of 81225123 is about 433.0753441988.

The spelling of 81225123 in words is "eighty-one million, two hundred twenty-five thousand, one hundred twenty-three".