181013629 has 4 divisors (see below), whose sum is σ = 183047580. Its totient is φ = 178979680.

The previous prime is 181013561. The next prime is 181013633. The reversal of 181013629 is 926310181.

181013629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90725625 + 90288004 = 9525^2 + 9502^2 .

It is a cyclic number.

It is not a de Polignac number, because 181013629 - 2¹¹ = 181011581 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181013629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181013689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1016842 + ... + 1017019.

It is an arithmetic number, because the mean of its divisors is an integer number (45761895).

Almost surely, 2^181013629 is an apocalyptic number.

It is an amenable number.

181013629 is a deficient number, since it is larger than the sum of its proper divisors (2033951).

181013629 is an equidigital number, since it uses as much as digits as its factorization.

181013629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033950.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 181013629 is about 13454.1305553350. The cubic root of 181013629 is about 565.6794801120.

The spelling of 181013629 in words is "one hundred eighty-one million, thirteen thousand, six hundred twenty-nine".