1012660691 has 4 divisors (see below), whose sum is σ = 1157326512. Its totient is φ = 867994872.

The previous prime is 1012660679. The next prime is 1012660711. The reversal of 1012660691 is 1960662101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1012660691 - 2¹⁰ = 1012659667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012660661) 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, 72332900 + ... + 72332913.

It is an arithmetic number, because the mean of its divisors is an integer number (289331628).

Almost surely, 2^1012660691 is an apocalyptic number.

1012660691 is a deficient number, since it is larger than the sum of its proper divisors (144665821).

1012660691 is an equidigital number, since it uses as much as digits as its factorization.

1012660691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144665820.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1012660691 is about 31822.3300686798. The cubic root of 1012660691 is about 1004.2025442146.

The spelling of 1012660691 in words is "one billion, twelve million, six hundred sixty thousand, six hundred ninety-one".