145652561 has 2 divisors, whose sum is σ = 145652562. Its totient is φ = 145652560.

The previous prime is 145652543. The next prime is 145652621. The reversal of 145652561 is 165256541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141158161 + 4494400 = 11881^2 + 2120^2 .

It is a cyclic number.

It is not a de Polignac number, because 145652561 - 2⁶ = 145652497 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (145652501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72826280 + 72826281.

It is an arithmetic number, because the mean of its divisors is an integer number (72826281).

Almost surely, 2^145652561 is an apocalyptic number.

It is an amenable number.

145652561 is a deficient number, since it is larger than the sum of its proper divisors (1).

145652561 is an equidigital number, since it uses as much as digits as its factorization.

145652561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 35.

The square root of 145652561 is about 12068.6602819037. The cubic root of 145652561 is about 526.1457197700.

The spelling of 145652561 in words is "one hundred forty-five million, six hundred fifty-two thousand, five hundred sixty-one".