181201725 has 48 divisors (see below), whose sum is σ = 352477440. Its totient is φ = 90950400.

The previous prime is 181201703. The next prime is 181201729. The reversal of 181201725 is 527102181.

It is not a de Polignac number, because 181201725 - 2¹² = 181197629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181201729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3580 + ... + 19370.

It is an arithmetic number, because the mean of its divisors is an integer number (7343280).

Almost surely, 2^181201725 is an apocalyptic number.

181201725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181201725 is a deficient number, since it is larger than the sum of its proper divisors (171275715).

181201725 is a wasteful number, since it uses less digits than its factorization.

181201725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15827 (or 15816 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 181201725 is about 13461.1190099486. The cubic root of 181201725 is about 565.8753497348.

The spelling of 181201725 in words is "one hundred eighty-one million, two hundred one thousand, seven hundred twenty-five".