145977509 has 2 divisors, whose sum is σ = 145977510. Its totient is φ = 145977508.

The previous prime is 145977493. The next prime is 145977511. The reversal of 145977509 is 905779541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89397025 + 56580484 = 9455^2 + 7522^2 .

It is an emirp because it is prime and its reverse (905779541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145977509 - 2⁴ = 145977493 is a prime.

Together with 145977511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145977709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72988754 + 72988755.

It is an arithmetic number, because the mean of its divisors is an integer number (72988755).

Almost surely, 2^145977509 is an apocalyptic number.

It is an amenable number.

145977509 is a deficient number, since it is larger than the sum of its proper divisors (1).

145977509 is an equidigital number, since it uses as much as digits as its factorization.

145977509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 396900, while the sum is 47.

The square root of 145977509 is about 12082.1152535473. The cubic root of 145977509 is about 526.5367027411.

The spelling of 145977509 in words is "one hundred forty-five million, nine hundred seventy-seven thousand, five hundred nine".