145561693 has 2 divisors, whose sum is σ = 145561694. Its totient is φ = 145561692.

The previous prime is 145561651. The next prime is 145561727. The reversal of 145561693 is 396165541.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79334649 + 66227044 = 8907^2 + 8138^2 .

It is an emirp because it is prime and its reverse (396165541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145561693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145561613) 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, 72780846 + 72780847.

It is an arithmetic number, because the mean of its divisors is an integer number (72780847).

Almost surely, 2^145561693 is an apocalyptic number.

It is an amenable number.

145561693 is a deficient number, since it is larger than the sum of its proper divisors (1).

145561693 is an equidigital number, since it uses as much as digits as its factorization.

145561693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 40.

The square root of 145561693 is about 12064.8950679233. The cubic root of 145561693 is about 526.0362818155.

The spelling of 145561693 in words is "one hundred forty-five million, five hundred sixty-one thousand, six hundred ninety-three".