181026645 has 16 divisors (see below), whose sum is σ = 290717952. Its totient is φ = 96189120.

The previous prime is 181026631. The next prime is 181026647. The reversal of 181026645 is 546620181.

It is not a de Polignac number, because 181026645 - 2⁶ = 181026581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181026647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18202 + ... + 26331.

It is an arithmetic number, because the mean of its divisors is an integer number (18169872).

Almost surely, 2^181026645 is an apocalyptic number.

181026645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181026645 is a deficient number, since it is larger than the sum of its proper divisors (109691307).

181026645 is a wasteful number, since it uses less digits than its factorization.

181026645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44812.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 181026645 is about 13454.6142642589. The cubic root of 181026645 is about 565.6930384054.

The spelling of 181026645 in words is "one hundred eighty-one million, twenty-six thousand, six hundred forty-five".