1631679459517 has 4 divisors (see below), whose sum is σ = 1631759163516. Its totient is φ = 1631599755520.

The previous prime is 1631679459503. The next prime is 1631679459583. The reversal of 1631679459517 is 7159549761361.

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 1430956643076 + 200722816441 = 1196226^2 + 448021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1631679459517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631679459217) 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, 39821284 + ... + 39862237.

It is an arithmetic number, because the mean of its divisors is an integer number (407939790879).

Almost surely, 2^{1631679459517} is an apocalyptic number.

It is an amenable number.

1631679459517 is a deficient number, since it is larger than the sum of its proper divisors (79703999).

1631679459517 is an equidigital number, since it uses as much as digits as its factorization.

1631679459517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79703998.

The product of its digits is 42865200, while the sum is 64.

The spelling of 1631679459517 in words is "one trillion, six hundred thirty-one billion, six hundred seventy-nine million, four hundred fifty-nine thousand, five hundred seventeen".