1396963521691 has 4 divisors (see below), whose sum is σ = 1397788664272. Its totient is φ = 1396138379112.

The previous prime is 1396963521647. The next prime is 1396963521703. The reversal of 1396963521691 is 1961253696931.

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 1396963521691 - 2¹⁵ = 1396963488923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1396963521601) 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, 412568751 + ... + 412572136.

It is an arithmetic number, because the mean of its divisors is an integer number (349447166068).

Almost surely, 2^{1396963521691} is an apocalyptic number.

1396963521691 is a deficient number, since it is larger than the sum of its proper divisors (825142581).

1396963521691 is an equidigital number, since it uses as much as digits as its factorization.

1396963521691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825142580.

The product of its digits is 14171760, while the sum is 61.

The spelling of 1396963521691 in words is "one trillion, three hundred ninety-six billion, nine hundred sixty-three million, five hundred twenty-one thousand, six hundred ninety-one".