145565639 has 2 divisors, whose sum is σ = 145565640. Its totient is φ = 145565638.

The previous prime is 145565617. The next prime is 145565647. The reversal of 145565639 is 936565541.

It is a strong prime.

It is an emirp because it is prime and its reverse (936565541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145565639 - 2²⁴ = 128788423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145565639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145535639) 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, 72782819 + 72782820.

It is an arithmetic number, because the mean of its divisors is an integer number (72782820).

Almost surely, 2^145565639 is an apocalyptic number.

145565639 is a deficient number, since it is larger than the sum of its proper divisors (1).

145565639 is an equidigital number, since it uses as much as digits as its factorization.

145565639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 44.

The square root of 145565639 is about 12065.0585991117. The cubic root of 145565639 is about 526.0410351732.

The spelling of 145565639 in words is "one hundred forty-five million, five hundred sixty-five thousand, six hundred thirty-nine".