145052561 has 2 divisors, whose sum is σ = 145052562. Its totient is φ = 145052560.

The previous prime is 145052507. The next prime is 145052569. The reversal of 145052561 is 165250541.

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., 143256961 + 1795600 = 11969^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 145052561 - 2⁶ = 145052497 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 (145052569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72526280 + 72526281.

It is an arithmetic number, because the mean of its divisors is an integer number (72526281).

Almost surely, 2^145052561 is an apocalyptic number.

It is an amenable number.

145052561 is a deficient number, since it is larger than the sum of its proper divisors (1).

145052561 is an equidigital number, since it uses as much as digits as its factorization.

145052561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 145052561 is about 12043.7768577801. The cubic root of 145052561 is about 525.4222586225.

The spelling of 145052561 in words is "one hundred forty-five million, fifty-two thousand, five hundred sixty-one".