145517249 has 2 divisors, whose sum is σ = 145517250. Its totient is φ = 145517248.

The previous prime is 145517231. The next prime is 145517261. The reversal of 145517249 is 942715541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144769024 + 748225 = 12032^2 + 865^2 .

It is an emirp because it is prime and its reverse (942715541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145517249 - 2²⁰ = 144468673 is a prime.

It is not a weakly prime, because it can be changed into another prime (145517209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72758624 + 72758625.

It is an arithmetic number, because the mean of its divisors is an integer number (72758625).

Almost surely, 2^145517249 is an apocalyptic number.

It is an amenable number.

145517249 is a deficient number, since it is larger than the sum of its proper divisors (1).

145517249 is an equidigital number, since it uses as much as digits as its factorization.

145517249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

The square root of 145517249 is about 12063.0530546790. The cubic root of 145517249 is about 525.9827385701.

The spelling of 145517249 in words is "one hundred forty-five million, five hundred seventeen thousand, two hundred forty-nine".