1691484926041 has 3 divisors (see below), whose sum is σ = 1691486226613. Its totient is φ = 1691483625470.

The previous prime is 1691484926029. The next prime is 1691484926051. The reversal of 1691484926041 is 1406294841961.

The square root of 1691484926041 is 1300571.

It is a perfect power (a square), and thus also a powerful number.

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 not a de Polignac number, because 1691484926041 - 2¹¹ = 1691484923993 is a prime.

It is a super-2 number, since 2×1691484926041² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1691484926051) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 650286 + ... + 1950856.

Almost surely, 2^{1691484926041} is an apocalyptic number.

1691484926041 is the 1300571-st square number.

1691484926041 is the 650286-th centered octagonal number.

It is an amenable number.

1691484926041 is a deficient number, since it is larger than the sum of its proper divisors (1300572).

1691484926041 is an frugal number, since it uses more digits than its factorization.

1691484926041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601142 (or 1300571 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 55.

The spelling of 1691484926041 in words is "one trillion, six hundred ninety-one billion, four hundred eighty-four million, nine hundred twenty-six thousand, forty-one".