145692509 has 2 divisors, whose sum is σ = 145692510. Its totient is φ = 145692508.

The previous prime is 145692487. The next prime is 145692517. The reversal of 145692509 is 905296541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124255609 + 21436900 = 11147^2 + 4630^2 .

It is an emirp because it is prime and its reverse (905296541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145692509 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145692539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72846254 + 72846255.

It is an arithmetic number, because the mean of its divisors is an integer number (72846255).

Almost surely, 2^145692509 is an apocalyptic number.

It is an amenable number.

145692509 is a deficient number, since it is larger than the sum of its proper divisors (1).

145692509 is an equidigital number, since it uses as much as digits as its factorization.

145692509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 145692509 is about 12070.3151988670. The cubic root of 145692509 is about 526.1938172146.

The spelling of 145692509 in words is "one hundred forty-five million, six hundred ninety-two thousand, five hundred nine".