10191012649 has 4 divisors (see below), whose sum is σ = 10330615636. Its totient is φ = 10051409664.

The previous prime is 10191012613. The next prime is 10191012673. The reversal of 10191012649 is 94621019101.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8268628624 + 1922384025 = 90932^2 + 43845^2 .

It is a cyclic number.

It is not a de Polignac number, because 10191012649 - 2¹⁵ = 10190979881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10191012149) 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, 69801384 + ... + 69801529.

It is an arithmetic number, because the mean of its divisors is an integer number (2582653909).

Almost surely, 2^10191012649 is an apocalyptic number.

It is an amenable number.

10191012649 is a deficient number, since it is larger than the sum of its proper divisors (139602987).

10191012649 is an equidigital number, since it uses as much as digits as its factorization.

10191012649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139602986.

The product of its (nonzero) digits is 3888, while the sum is 34.

The spelling of 10191012649 in words is "ten billion, one hundred ninety-one million, twelve thousand, six hundred forty-nine".