2015520761 has 2 divisors, whose sum is σ = 2015520762. Its totient is φ = 2015520760.

The previous prime is 2015520743. The next prime is 2015520781. The reversal of 2015520761 is 1670255102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1166905600 + 848615161 = 34160^2 + 29131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2015520761 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2015520781) 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 as a sum of consecutive naturals, namely, 1007760380 + 1007760381.

It is an arithmetic number, because the mean of its divisors is an integer number (1007760381).

Almost surely, 2^2015520761 is an apocalyptic number.

It is an amenable number.

2015520761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015520761 is an equidigital number, since it uses as much as digits as its factorization.

2015520761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 2015520761 is about 44894.5515736598. The cubic root of 2015520761 is about 1263.1718108755.

Adding to 2015520761 its reverse (1670255102), we get a palindrome (3685775863).

The spelling of 2015520761 in words is "two billion, fifteen million, five hundred twenty thousand, seven hundred sixty-one".