1000515661 has 16 divisors (see below), whose sum is σ = 1091059200. Its totient is φ = 914284800.

The previous prime is 1000515647. The next prime is 1000515697. The reversal of 1000515661 is 1665150001.

1000515661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1000515661 - 2⁷ = 1000515533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000515611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62116 + ... + 76546.

It is an arithmetic number, because the mean of its divisors is an integer number (68191200).

Almost surely, 2^1000515661 is an apocalyptic number.

It is an amenable number.

1000515661 is a deficient number, since it is larger than the sum of its proper divisors (90543539).

1000515661 is a wasteful number, since it uses less digits than its factorization.

1000515661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14580.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1000515661 is about 31630.9288671705. The cubic root of 1000515661 is about 1000.1718574633.

Adding to 1000515661 its reverse (1665150001), we get a palindrome (2665665662).

The spelling of 1000515661 in words is "one billion, five hundred fifteen thousand, six hundred sixty-one".