81225927 has 12 divisors (see below), whose sum is σ = 117885144. Its totient is φ = 53892720.

The previous prime is 81225919. The next prime is 81225941. The reversal of 81225927 is 72952218.

It is not a de Polignac number, because 81225927 - 2³ = 81225919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81225891 and 81225900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81225427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19488 + ... + 23285.

It is an arithmetic number, because the mean of its divisors is an integer number (9823762).

Almost surely, 2^81225927 is an apocalyptic number.

81225927 is a deficient number, since it is larger than the sum of its proper divisors (36659217).

81225927 is a wasteful number, since it uses less digits than its factorization.

81225927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42990 (or 42987 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 81225927 is about 9012.5427599540. The cubic root of 81225927 is about 433.0767731140.

The spelling of 81225927 in words is "eighty-one million, two hundred twenty-five thousand, nine hundred twenty-seven".