181858057 has 2 divisors, whose sum is σ = 181858058. Its totient is φ = 181858056.

The previous prime is 181858049. The next prime is 181858067. The reversal of 181858057 is 750858181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144696841 + 37161216 = 12029^2 + 6096^2 .

It is a cyclic number.

It is not a de Polignac number, because 181858057 - 2³ = 181858049 is a prime.

It is a super-3 number, since 3×181858057³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (181858007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90929028 + 90929029.

It is an arithmetic number, because the mean of its divisors is an integer number (90929029).

Almost surely, 2^181858057 is an apocalyptic number.

It is an amenable number.

181858057 is a deficient number, since it is larger than the sum of its proper divisors (1).

181858057 is an equidigital number, since it uses as much as digits as its factorization.

181858057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89600, while the sum is 43.

The square root of 181858057 is about 13485.4757795192. The cubic root of 181858057 is about 566.5577468089.

The spelling of 181858057 in words is "one hundred eighty-one million, eight hundred fifty-eight thousand, fifty-seven".