145549813 has 2 divisors, whose sum is σ = 145549814. Its totient is φ = 145549812.

The previous prime is 145549783. The next prime is 145549829. The reversal of 145549813 is 318945541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145395364 + 154449 = 12058^2 + 393^2 .

It is a cyclic number.

It is not a de Polignac number, because 145549813 - 2⁹ = 145549301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145549013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72774906 + 72774907.

It is an arithmetic number, because the mean of its divisors is an integer number (72774907).

Almost surely, 2^145549813 is an apocalyptic number.

It is an amenable number.

145549813 is a deficient number, since it is larger than the sum of its proper divisors (1).

145549813 is an equidigital number, since it uses as much as digits as its factorization.

145549813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 40.

The square root of 145549813 is about 12064.4027204002. The cubic root of 145549813 is about 526.0219706302.

The spelling of 145549813 in words is "one hundred forty-five million, five hundred forty-nine thousand, eight hundred thirteen".