181312630 has 16 divisors (see below), whose sum is σ = 343540080. Its totient is φ = 68707872.

The previous prime is 181312627. The next prime is 181312631. The reversal of 181312630 is 36213181.

It is a junction number, because it is equal to n+sod(n) for n = 181312595 and 181312604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181312631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476949 + ... + 477328.

It is an arithmetic number, because the mean of its divisors is an integer number (21471255).

Almost surely, 2^181312630 is an apocalyptic number.

181312630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181312630 is a deficient number, since it is larger than the sum of its proper divisors (162227450).

181312630 is a wasteful number, since it uses less digits than its factorization.

181312630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954303.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 181312630 is about 13465.2378367409. The cubic root of 181312630 is about 565.9907746960.

The spelling of 181312630 in words is "one hundred eighty-one million, three hundred twelve thousand, six hundred thirty".