1991473624297 has 2 divisors, whose sum is σ = 1991473624298. Its totient is φ = 1991473624296.

The previous prime is 1991473624267. The next prime is 1991473624303. The reversal of 1991473624297 is 7924263741991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1941686181136 + 49787443161 = 1393444^2 + 223131^2 .

It is a cyclic number.

It is not a de Polignac number, because 1991473624297 - 2¹⁵ = 1991473591529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1991473624267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995736812148 + 995736812149.

It is an arithmetic number, because the mean of its divisors is an integer number (995736812149).

Almost surely, 2^{1991473624297} is an apocalyptic number.

It is an amenable number.

1991473624297 is a deficient number, since it is larger than the sum of its proper divisors (1).

1991473624297 is an equidigital number, since it uses as much as digits as its factorization.

1991473624297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41150592, while the sum is 64.

The spelling of 1991473624297 in words is "one trillion, nine hundred ninety-one billion, four hundred seventy-three million, six hundred twenty-four thousand, two hundred ninety-seven".