1934447656891 has 2 divisors, whose sum is σ = 1934447656892. Its totient is φ = 1934447656890.

The previous prime is 1934447656877. The next prime is 1934447656927. The reversal of 1934447656891 is 1986567444391.

It is a weak prime.

It is an emirp because it is prime and its reverse (1986567444391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1934447656891 - 2²⁵ = 1934414102459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1934447656871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 967223828445 + 967223828446.

It is an arithmetic number, because the mean of its divisors is an integer number (967223828446).

Almost surely, 2^{1934447656891} is an apocalyptic number.

1934447656891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1934447656891 is an equidigital number, since it uses as much as digits as its factorization.

1934447656891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156764160, while the sum is 67.

The spelling of 1934447656891 in words is "one trillion, nine hundred thirty-four billion, four hundred forty-seven million, six hundred fifty-six thousand, eight hundred ninety-one".