1015661513 has 4 divisors (see below), whose sum is σ = 1017132048. Its totient is φ = 1014190980.

The previous prime is 1015661497. The next prime is 1015661539. The reversal of 1015661513 is 3151665101.

1015661513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1015661513 - 2⁴ = 1015661497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1015663513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734231 + ... + 735612.

It is an arithmetic number, because the mean of its divisors is an integer number (254283012).

Almost surely, 2^1015661513 is an apocalyptic number.

It is an amenable number.

1015661513 is a deficient number, since it is larger than the sum of its proper divisors (1470535).

1015661513 is an equidigital number, since it uses as much as digits as its factorization.

1015661513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470534.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 1015661513 is about 31869.4448178816. Note that the first 3 decimals coincide. The cubic root of 1015661513 is about 1005.1934853499.

The spelling of 1015661513 in words is "one billion, fifteen million, six hundred sixty-one thousand, five hundred thirteen".