247985077 has 2 divisors, whose sum is σ = 247985078. Its totient is φ = 247985076.

The previous prime is 247985053. The next prime is 247985099. The reversal of 247985077 is 770589742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222188836 + 25796241 = 14906^2 + 5079^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247985077 is a prime.

It is a super-2 number, since 2×247985077² = 122993196829391858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247985077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247925077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123992538 + 123992539.

It is an arithmetic number, because the mean of its divisors is an integer number (123992539).

Almost surely, 2^247985077 is an apocalyptic number.

It is an amenable number.

247985077 is a deficient number, since it is larger than the sum of its proper divisors (1).

247985077 is an equidigital number, since it uses as much as digits as its factorization.

247985077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 987840, while the sum is 49.

The square root of 247985077 is about 15747.5419351720. The cubic root of 247985077 is about 628.2635283912.

The spelling of 247985077 in words is "two hundred forty-seven million, nine hundred eighty-five thousand, seventy-seven".