1247045977 has 2 divisors, whose sum is σ = 1247045978. Its totient is φ = 1247045976.

The previous prime is 1247045963. The next prime is 1247046011. The reversal of 1247045977 is 7795407421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1127012041 + 120033936 = 33571^2 + 10956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247045977 - 2²³ = 1238657369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1247045927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623522988 + 623522989.

It is an arithmetic number, because the mean of its divisors is an integer number (623522989).

Almost surely, 2^1247045977 is an apocalyptic number.

It is an amenable number.

1247045977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247045977 is an equidigital number, since it uses as much as digits as its factorization.

1247045977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 493920, while the sum is 46.

The square root of 1247045977 is about 35313.5381546511. The cubic root of 1247045977 is about 1076.3681090707.

The spelling of 1247045977 in words is "one billion, two hundred forty-seven million, forty-five thousand, nine hundred seventy-seven".