1500056561 has 2 divisors, whose sum is σ = 1500056562. Its totient is φ = 1500056560.

The previous prime is 1500056539. The next prime is 1500056567. The reversal of 1500056561 is 1656500051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1364194225 + 135862336 = 36935^2 + 11656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1500056561 - 2⁶ = 1500056497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1500056567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750028280 + 750028281.

It is an arithmetic number, because the mean of its divisors is an integer number (750028281).

Almost surely, 2^1500056561 is an apocalyptic number.

It is an amenable number.

1500056561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1500056561 is an equidigital number, since it uses as much as digits as its factorization.

1500056561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1500056561 is about 38730.5636545610. The cubic root of 1500056561 is about 1144.7286304130.

The spelling of 1500056561 in words is "one billion, five hundred million, fifty-six thousand, five hundred sixty-one".