145685081 has 2 divisors, whose sum is σ = 145685082. Its totient is φ = 145685080.

The previous prime is 145685077. The next prime is 145685083. The reversal of 145685081 is 180586541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142587481 + 3097600 = 11941^2 + 1760^2 .

It is a cyclic number.

It is not a de Polignac number, because 145685081 - 2² = 145685077 is a prime.

It is a super-2 number, since 2×145685081² = 42448285651953122, which contains 22 as substring.

Together with 145685083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145685083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72842540 + 72842541.

It is an arithmetic number, because the mean of its divisors is an integer number (72842541).

Almost surely, 2^145685081 is an apocalyptic number.

It is an amenable number.

145685081 is a deficient number, since it is larger than the sum of its proper divisors (1).

145685081 is an equidigital number, since it uses as much as digits as its factorization.

145685081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 145685081 is about 12070.0074979264. The cubic root of 145685081 is about 526.1848745583.

The spelling of 145685081 in words is "one hundred forty-five million, six hundred eighty-five thousand, eighty-one".