145747549 has 2 divisors, whose sum is σ = 145747550. Its totient is φ = 145747548.

The previous prime is 145747543. The next prime is 145747571. The reversal of 145747549 is 945747541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142205625 + 3541924 = 11925^2 + 1882^2 .

It is an emirp because it is prime and its reverse (945747541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145747549 - 2²⁷ = 11529821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145747499 and 145747508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145747543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72873774 + 72873775.

It is an arithmetic number, because the mean of its divisors is an integer number (72873775).

Almost surely, 2^145747549 is an apocalyptic number.

It is an amenable number.

145747549 is a deficient number, since it is larger than the sum of its proper divisors (1).

145747549 is an equidigital number, since it uses as much as digits as its factorization.

145747549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 46.

The square root of 145747549 is about 12072.5949571747. The cubic root of 145747549 is about 526.2600710474.

The spelling of 145747549 in words is "one hundred forty-five million, seven hundred forty-seven thousand, five hundred forty-nine".