1245975779 has 2 divisors, whose sum is σ = 1245975780. Its totient is φ = 1245975778.

The previous prime is 1245975763. The next prime is 1245975793. The reversal of 1245975779 is 9775795421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1245975779 - 2⁴ = 1245975763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1245975739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622987889 + 622987890.

It is an arithmetic number, because the mean of its divisors is an integer number (622987890).

Almost surely, 2^1245975779 is an apocalyptic number.

1245975779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245975779 is an equidigital number, since it uses as much as digits as its factorization.

1245975779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5556600, while the sum is 56.

The square root of 1245975779 is about 35298.3821017338. The cubic root of 1245975779 is about 1076.0601127608.

The spelling of 1245975779 in words is "one billion, two hundred forty-five million, nine hundred seventy-five thousand, seven hundred seventy-nine".