145222549 has 2 divisors, whose sum is σ = 145222550. Its totient is φ = 145222548.

The previous prime is 145222543. The next prime is 145222559. The reversal of 145222549 is 945222541.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85655025 + 59567524 = 9255^2 + 7718^2 .

It is an emirp because it is prime and its reverse (945222541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145222549 - 2⁹ = 145222037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145222543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72611274 + 72611275.

It is an arithmetic number, because the mean of its divisors is an integer number (72611275).

Almost surely, 2^145222549 is an apocalyptic number.

It is an amenable number.

145222549 is a deficient number, since it is larger than the sum of its proper divisors (1).

145222549 is an equidigital number, since it uses as much as digits as its factorization.

145222549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 34.

The square root of 145222549 is about 12050.8318799990. The cubic root of 145222549 is about 525.6274270369.

It can be divided in two parts, 145222 and 549, that multiplied together give a triangular number (79726878 = T₁₂₆₂₇).

The spelling of 145222549 in words is "one hundred forty-five million, two hundred twenty-two thousand, five hundred forty-nine".