145611709 has 2 divisors, whose sum is σ = 145611710. Its totient is φ = 145611708.

The previous prime is 145611701. The next prime is 145611721. The reversal of 145611709 is 907116541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 67289209 = 8850^2 + 8203^2 .

It is an emirp because it is prime and its reverse (907116541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145611709 - 2³ = 145611701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145611701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72805854 + 72805855.

It is an arithmetic number, because the mean of its divisors is an integer number (72805855).

Almost surely, 2^145611709 is an apocalyptic number.

It is an amenable number.

145611709 is a deficient number, since it is larger than the sum of its proper divisors (1).

145611709 is an equidigital number, since it uses as much as digits as its factorization.

145611709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 145611709 is about 12066.9676804075. The cubic root of 145611709 is about 526.0965248122.

The spelling of 145611709 in words is "one hundred forty-five million, six hundred eleven thousand, seven hundred nine".