1010015561 has 4 divisors (see below), whose sum is σ = 1017282000. Its totient is φ = 1002749124.

The previous prime is 1010015533. The next prime is 1010015563. The reversal of 1010015561 is 1655100101.

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 a de Polignac number, because none of the positive numbers 2^k-1010015561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1010015563) 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, 3633011 + ... + 3633288.

It is an arithmetic number, because the mean of its divisors is an integer number (254320500).

Almost surely, 2^1010015561 is an apocalyptic number.

It is an amenable number.

1010015561 is a deficient number, since it is larger than the sum of its proper divisors (7266439).

1010015561 is an equidigital number, since it uses as much as digits as its factorization.

1010015561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7266438.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 1010015561 is about 31780.7419831570. The cubic root of 1010015561 is about 1003.3274362213.

Adding to 1010015561 its reverse (1655100101), we get a palindrome (2665115662).

The spelling of 1010015561 in words is "one billion, ten million, fifteen thousand, five hundred sixty-one".