145000307561 has 4 divisors (see below), whose sum is σ = 145090203972. Its totient is φ = 144910411152.

The previous prime is 145000307519. The next prime is 145000307567. The reversal of 145000307561 is 165703000541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55769656336 + 89230651225 = 236156^2 + 298715^2 .

It is a cyclic number.

It is not a de Polignac number, because 145000307561 - 2²² = 144996113257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145000307567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44945786 + ... + 44949011.

It is an arithmetic number, because the mean of its divisors is an integer number (36272550993).

Almost surely, 2^145000307561 is an apocalyptic number.

It is an amenable number.

145000307561 is a deficient number, since it is larger than the sum of its proper divisors (89896411).

145000307561 is an equidigital number, since it uses as much as digits as its factorization.

145000307561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89896410.

The product of its (nonzero) digits is 12600, while the sum is 32.

The spelling of 145000307561 in words is "one hundred forty-five billion, three hundred seven thousand, five hundred sixty-one".