1931494904681 has 2 divisors, whose sum is σ = 1931494904682. Its totient is φ = 1931494904680.

The previous prime is 1931494904597. The next prime is 1931494904707. The reversal of 1931494904681 is 1864094941391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1054490749456 + 877004155225 = 1026884^2 + 936485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1931494904681 - 2²² = 1931490710377 is a prime.

It is a super-2 number, since 2×1931494904681² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1931494904681.

It is not a weakly prime, because it can be changed into another prime (1931494904881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965747452340 + 965747452341.

It is an arithmetic number, because the mean of its divisors is an integer number (965747452341).

Almost surely, 2^{1931494904681} is an apocalyptic number.

It is an amenable number.

1931494904681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1931494904681 is an equidigital number, since it uses as much as digits as its factorization.

1931494904681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 1931494904681 in words is "one trillion, nine hundred thirty-one billion, four hundred ninety-four million, nine hundred four thousand, six hundred eighty-one".