1421688546991 has 4 divisors (see below), whose sum is σ = 1421690932872. Its totient is φ = 1421686161112.

The previous prime is 1421688546973. The next prime is 1421688546997. The reversal of 1421688546991 is 1996458861241.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1421688546991 - 2⁵ = 1421688546959 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 (1421688546997) 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, 540000 + ... + 1770586.

It is an arithmetic number, because the mean of its divisors is an integer number (355422733218).

Almost surely, 2^{1421688546991} is an apocalyptic number.

1421688546991 is a deficient number, since it is larger than the sum of its proper divisors (2385881).

1421688546991 is a wasteful number, since it uses less digits than its factorization.

1421688546991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385880.

The product of its digits is 29859840, while the sum is 64.

The spelling of 1421688546991 in words is "one trillion, four hundred twenty-one billion, six hundred eighty-eight million, five hundred forty-six thousand, nine hundred ninety-one".