145691317 has 2 divisors, whose sum is σ = 145691318. Its totient is φ = 145691316.

The previous prime is 145691303. The next prime is 145691323. The reversal of 145691317 is 713196541.

It is a happy number.

145691317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132917841 + 12773476 = 11529^2 + 3574^2 .

It is an emirp because it is prime and its reverse (713196541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145691317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145691347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72845658 + 72845659.

It is an arithmetic number, because the mean of its divisors is an integer number (72845659).

Almost surely, 2^145691317 is an apocalyptic number.

It is an amenable number.

145691317 is a deficient number, since it is larger than the sum of its proper divisors (1).

145691317 is an equidigital number, since it uses as much as digits as its factorization.

145691317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 145691317 is about 12070.2658214308. The cubic root of 145691317 is about 526.1923821723.

The spelling of 145691317 in words is "one hundred forty-five million, six hundred ninety-one thousand, three hundred seventeen".