1971623107973 has 2 divisors, whose sum is σ = 1971623107974. Its totient is φ = 1971623107972.

The previous prime is 1971623107933. The next prime is 1971623108093. The reversal of 1971623107973 is 3797013261791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1247561665249 + 724061442724 = 1116943^2 + 850918^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971623107973 - 2²⁰ = 1971622059397 is a prime.

It is a super-2 number, since 2×1971623107973² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971623107933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985811553986 + 985811553987.

It is an arithmetic number, because the mean of its divisors is an integer number (985811553987).

Almost surely, 2^{1971623107973} is an apocalyptic number.

It is an amenable number.

1971623107973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971623107973 is an equidigital number, since it uses as much as digits as its factorization.

1971623107973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000564, while the sum is 56.

The spelling of 1971623107973 in words is "one trillion, nine hundred seventy-one billion, six hundred twenty-three million, one hundred seven thousand, nine hundred seventy-three".