247978581197 has 2 divisors, whose sum is σ = 247978581198. Its totient is φ = 247978581196.

The previous prime is 247978581163. The next prime is 247978581203. The reversal of 247978581197 is 791185879742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175304665636 + 72673915561 = 418694^2 + 269581^2 .

It is a cyclic number.

It is not a de Polignac number, because 247978581197 - 2¹⁶ = 247978515661 is a prime.

It is a super-2 number, since 2×247978581197² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247978581127) 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, 123989290598 + 123989290599.

It is an arithmetic number, because the mean of its divisors is an integer number (123989290599).

Almost surely, 2^247978581197 is an apocalyptic number.

It is an amenable number.

247978581197 is a deficient number, since it is larger than the sum of its proper divisors (1).

247978581197 is an equidigital number, since it uses as much as digits as its factorization.

247978581197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71124480, while the sum is 68.

The spelling of 247978581197 in words is "two hundred forty-seven billion, nine hundred seventy-eight million, five hundred eighty-one thousand, one hundred ninety-seven".