1839781339491 has 16 divisors (see below), whose sum is σ = 2467485679104. Its totient is φ = 1219320034464.

The previous prime is 1839781339471. The next prime is 1839781339579. The reversal of 1839781339491 is 1949331879381.

It is a de Polignac number, because none of the positive numbers 2^k-1839781339491 is a prime.

It is a super-2 number, since 2×1839781339491² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1839781339411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2286645 + ... + 2984678.

It is an arithmetic number, because the mean of its divisors is an integer number (154217854944).

Almost surely, 2^{1839781339491} is an apocalyptic number.

1839781339491 is a deficient number, since it is larger than the sum of its proper divisors (627704339613).

1839781339491 is a wasteful number, since it uses less digits than its factorization.

1839781339491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5272010.

The product of its digits is 35271936, while the sum is 66.

The spelling of 1839781339491 in words is "one trillion, eight hundred thirty-nine billion, seven hundred eighty-one million, three hundred thirty-nine thousand, four hundred ninety-one".