181387048 has 8 divisors (see below), whose sum is σ = 340100730. Its totient is φ = 90693520.

The previous prime is 181387043. The next prime is 181387049. The reversal of 181387048 is 840783181.

It can be written as a sum of positive squares in only one way, i.e., 181225444 + 161604 = 13462^2 + 402^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×181387048² = 65802522364308608, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 181387048.

It is not an unprimeable number, because it can be changed into a prime (181387043) 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 as a sum of consecutive naturals, namely, 11336683 + ... + 11336698.

Almost surely, 2^181387048 is an apocalyptic number.

It is an amenable number.

181387048 is a deficient number, since it is larger than the sum of its proper divisors (158713682).

181387048 is a wasteful number, since it uses less digits than its factorization.

181387048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22673387 (or 22673383 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 181387048 is about 13468.0008910009. Note that the first 3 decimals coincide. The cubic root of 181387048 is about 566.0681992347.

The spelling of 181387048 in words is "one hundred eighty-one million, three hundred eighty-seven thousand, forty-eight".