1421971583761 has 4 divisors (see below), whose sum is σ = 1421973968692. Its totient is φ = 1421969198832.

The previous prime is 1421971583731. The next prime is 1421971583789. The reversal of 1421971583761 is 1673851791241.

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 can be written as a sum of positive squares in 2 ways, for example, as 776751382225 + 645220201536 = 881335^2 + 803256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421971583761 - 2⁵ = 1421971583729 is a prime.

It is the 1192465-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421971583731) by changing a digit.

It is a nontrivial repunit in base 1192464.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594595 + ... + 1788151.

It is an arithmetic number, because the mean of its divisors is an integer number (355493492173).

It is a 596232-hyperperfect number.

Almost surely, 2^{1421971583761} is an apocalyptic number.

It is an amenable number.

1421971583761 is a deficient number, since it is larger than the sum of its proper divisors (2384931).

1421971583761 is a wasteful number, since it uses less digits than its factorization.

1421971583761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384930.

The product of its digits is 2540160, while the sum is 55.

The spelling of 1421971583761 in words is "one trillion, four hundred twenty-one billion, nine hundred seventy-one million, five hundred eighty-three thousand, seven hundred sixty-one".