145581517 has 2 divisors, whose sum is σ = 145581518. Its totient is φ = 145581516.

The previous prime is 145581503. The next prime is 145581521. The reversal of 145581517 is 715185541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85581001 + 60000516 = 9251^2 + 7746^2 .

It is a cyclic number.

It is not a de Polignac number, because 145581517 - 2⁷ = 145581389 is a prime.

It is a pancake number, because a pancake can be divided into 145581517 parts by 17063 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145581587) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72790758 + 72790759.

It is an arithmetic number, because the mean of its divisors is an integer number (72790759).

Almost surely, 2^145581517 is an apocalyptic number.

It is an amenable number.

145581517 is a deficient number, since it is larger than the sum of its proper divisors (1).

145581517 is an equidigital number, since it uses as much as digits as its factorization.

145581517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28000, while the sum is 37.

The square root of 145581517 is about 12065.7165970364. The cubic root of 145581517 is about 526.0601609686.

The spelling of 145581517 in words is "one hundred forty-five million, five hundred eighty-one thousand, five hundred seventeen".