181906925 has 6 divisors (see below), whose sum is σ = 225564618. Its totient is φ = 145525520.

The previous prime is 181906889. The next prime is 181906927. The reversal of 181906925 is 529609181.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 896809 + 181010116 = 947^2 + 13454^2 .

It is not a de Polignac number, because 181906925 - 2¹⁰ = 181905901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181906927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3638114 + ... + 3638163.

It is an arithmetic number, because the mean of its divisors is an integer number (37594103).

Almost surely, 2^181906925 is an apocalyptic number.

It is an amenable number.

181906925 is a deficient number, since it is larger than the sum of its proper divisors (43657693).

181906925 is an equidigital number, since it uses as much as digits as its factorization.

181906925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276287 (or 7276282 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 181906925 is about 13487.2875330809. The cubic root of 181906925 is about 566.6084897983.

The spelling of 181906925 in words is "one hundred eighty-one million, nine hundred six thousand, nine hundred twenty-five".