2651891017 has 4 divisors (see below), whose sum is σ = 2654915716. Its totient is φ = 2648866320.

The previous prime is 2651890999. The next prime is 2651891023. The reversal of 2651891017 is 7101981562.

It is a happy number.

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 830650041 + 1821240976 = 28821^2 + 42676^2 .

It is a cyclic number.

It is not a de Polignac number, because 2651891017 - 2¹¹ = 2651888969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2651891027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511034 + ... + 1512787.

It is an arithmetic number, because the mean of its divisors is an integer number (663728929).

Almost surely, 2^2651891017 is an apocalyptic number.

It is an amenable number.

2651891017 is a deficient number, since it is larger than the sum of its proper divisors (3024699).

2651891017 is an equidigital number, since it uses as much as digits as its factorization.

2651891017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024698.

The product of its (nonzero) digits is 30240, while the sum is 40.

The square root of 2651891017 is about 51496.5146102142. The cubic root of 2651891017 is about 1384.1565878117.

The spelling of 2651891017 in words is "two billion, six hundred fifty-one million, eight hundred ninety-one thousand, seventeen".