1015051561 has 2 divisors, whose sum is σ = 1015051562. Its totient is φ = 1015051560.

The previous prime is 1015051559. The next prime is 1015051579. The reversal of 1015051561 is 1651505101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 557904400 + 457147161 = 23620^2 + 21381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1015051561 - 2¹ = 1015051559 is a prime.

Together with 1015051559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1015051511) 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, 507525780 + 507525781.

It is an arithmetic number, because the mean of its divisors is an integer number (507525781).

Almost surely, 2^1015051561 is an apocalyptic number.

It is an amenable number.

1015051561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1015051561 is an equidigital number, since it uses as much as digits as its factorization.

1015051561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 25.

The square root of 1015051561 is about 31859.8738384194. The cubic root of 1015051561 is about 1004.9922232346.

Adding to 1015051561 its reverse (1651505101), we get a palindrome (2666556662).

The spelling of 1015051561 in words is "one billion, fifteen million, fifty-one thousand, five hundred sixty-one".