145816549 has 2 divisors, whose sum is σ = 145816550. Its totient is φ = 145816548.

The previous prime is 145816543. The next prime is 145816577. The reversal of 145816549 is 945618541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127283524 + 18533025 = 11282^2 + 4305^2 .

It is a cyclic number.

It is not a de Polignac number, because 145816549 - 2¹³ = 145808357 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145816543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72908274 + 72908275.

It is an arithmetic number, because the mean of its divisors is an integer number (72908275).

Almost surely, 2^145816549 is an apocalyptic number.

It is an amenable number.

145816549 is a deficient number, since it is larger than the sum of its proper divisors (1).

145816549 is an equidigital number, since it uses as much as digits as its factorization.

145816549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 43.

The square root of 145816549 is about 12075.4523310723. The cubic root of 145816549 is about 526.3431055280.

The spelling of 145816549 in words is "one hundred forty-five million, eight hundred sixteen thousand, five hundred forty-nine".