1247766853 has 2 divisors, whose sum is σ = 1247766854. Its totient is φ = 1247766852.

The previous prime is 1247766829. The next prime is 1247766887. The reversal of 1247766853 is 3586677421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1135555204 + 112211649 = 33698^2 + 10593^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247766853 - 2⁹ = 1247766341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1247766797 and 1247766806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247766893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623883426 + 623883427.

It is an arithmetic number, because the mean of its divisors is an integer number (623883427).

Almost surely, 2^1247766853 is an apocalyptic number.

It is an amenable number.

1247766853 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247766853 is an equidigital number, since it uses as much as digits as its factorization.

1247766853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 49.

The square root of 1247766853 is about 35323.7434737600. The cubic root of 1247766853 is about 1076.5754733771.

The spelling of 1247766853 in words is "one billion, two hundred forty-seven million, seven hundred sixty-six thousand, eight hundred fifty-three".