181545457 has 2 divisors, whose sum is σ = 181545458. Its totient is φ = 181545456.

The previous prime is 181545439. The next prime is 181545473. The reversal of 181545457 is 754545181.

181545457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167340096 + 14205361 = 12936^2 + 3769^2 .

It is a cyclic number.

It is not a de Polignac number, because 181545457 - 2²⁷ = 47327729 is a prime.

It is not a weakly prime, because it can be changed into another prime (181545407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90772728 + 90772729.

It is an arithmetic number, because the mean of its divisors is an integer number (90772729).

Almost surely, 2^181545457 is an apocalyptic number.

It is an amenable number.

181545457 is a deficient number, since it is larger than the sum of its proper divisors (1).

181545457 is an equidigital number, since it uses as much as digits as its factorization.

181545457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112000, while the sum is 40.

The square root of 181545457 is about 13473.8805471920. The cubic root of 181545457 is about 566.2329375799.

The spelling of 181545457 in words is "one hundred eighty-one million, five hundred forty-five thousand, four hundred fifty-seven".