181306630 has 8 divisors (see below), whose sum is σ = 326351952. Its totient is φ = 72522648.

The previous prime is 181306621. The next prime is 181306661. The reversal of 181306630 is 36603181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9065322 + ... + 9065341.

It is an arithmetic number, because the mean of its divisors is an integer number (40793994).

Almost surely, 2^181306630 is an apocalyptic number.

181306630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181306630 is a deficient number, since it is larger than the sum of its proper divisors (145045322).

181306630 is a wasteful number, since it uses less digits than its factorization.

181306630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18130670.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 181306630 is about 13465.0150389816. The cubic root of 181306630 is about 565.9845313690.

The spelling of 181306630 in words is "one hundred eighty-one million, three hundred six thousand, six hundred thirty".