145549 has 2 divisors, whose sum is σ = 145550. Its totient is φ = 145548.

The previous prime is 145547. The next prime is 145577. The reversal of 145549 is 945541.

145549 = T₃₁₀ + T₃₁₁ + T₃₁₂.

It is an a-pointer prime, because the next prime (145577) can be obtained adding 145549 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 8649 = 370^2 + 93^2 .

It is a cyclic number.

It is not a de Polignac number, because 145549 - 2¹ = 145547 is a prime.

It is a super-2 number, since 2×145549² = 42369022802, which contains 22 as substring.

Together with 145547, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72774 + 72775.

It is an arithmetic number, because the mean of its divisors is an integer number (72775).

2¹⁴⁵⁵⁴⁹ is an apocalyptic number.

145549 is the 312-nd centered triangular number.

It is an amenable number.

145549 is a deficient number, since it is larger than the sum of its proper divisors (1).

145549 is an equidigital number, since it uses as much as digits as its factorization.

145549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The square root of 145549 is about 381.5088465554. The cubic root of 145549 is about 52.6020991225.

The spelling of 145549 in words is "one hundred forty-five thousand, five hundred forty-nine".