181378057 has 8 divisors (see below), whose sum is σ = 211520000. Its totient is φ = 155466612.

The previous prime is 181378037. The next prime is 181378061. The reversal of 181378057 is 750873181.

It is a happy number.

181378057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181378057 - 2²³ = 172989449 is a prime.

It is a super-2 number, since 2×181378057² = 65795999122190498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181378027) 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, 264057 + ... + 264742.

It is an arithmetic number, because the mean of its divisors is an integer number (26440000).

Almost surely, 2^181378057 is an apocalyptic number.

It is an amenable number.

181378057 is a deficient number, since it is larger than the sum of its proper divisors (30141943).

181378057 is an frugal number, since it uses more digits than its factorization.

181378057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528820 (or 528806 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 40.

The square root of 181378057 is about 13467.6670956777. The cubic root of 181378057 is about 566.0588461169.

The spelling of 181378057 in words is "one hundred eighty-one million, three hundred seventy-eight thousand, fifty-seven".