1971851023 has 2 divisors, whose sum is σ = 1971851024. Its totient is φ = 1971851022.

The previous prime is 1971851009. The next prime is 1971851051. The reversal of 1971851023 is 3201581791.

It is a weak prime.

It is an emirp because it is prime and its reverse (3201581791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971851023 is a prime.

It is a super-7 number, since 7×1971851023⁷ (a number of 66 digits) contains 7777777 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971851053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985925511 + 985925512.

It is an arithmetic number, because the mean of its divisors is an integer number (985925512).

Almost surely, 2^1971851023 is an apocalyptic number.

1971851023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971851023 is an equidigital number, since it uses as much as digits as its factorization.

1971851023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 1971851023 is about 44405.5291940092. The cubic root of 1971851023 is about 1253.9821851958.

The spelling of 1971851023 in words is "one billion, nine hundred seventy-one million, eight hundred fifty-one thousand, twenty-three".