1871610993947 has 2 divisors, whose sum is σ = 1871610993948. Its totient is φ = 1871610993946.

The previous prime is 1871610993919. The next prime is 1871610993971. The reversal of 1871610993947 is 7493990161781.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1871610993947 - 2²⁰ = 1871609945371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1871610993247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935805496973 + 935805496974.

It is an arithmetic number, because the mean of its divisors is an integer number (935805496974).

Almost surely, 2^{1871610993947} is an apocalyptic number.

1871610993947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1871610993947 is an equidigital number, since it uses as much as digits as its factorization.

1871610993947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20575296, while the sum is 65.

The spelling of 1871610993947 in words is "one trillion, eight hundred seventy-one billion, six hundred ten million, nine hundred ninety-three thousand, nine hundred forty-seven".