1245571979 has 2 divisors, whose sum is σ = 1245571980. Its totient is φ = 1245571978.

The previous prime is 1245571967. The next prime is 1245572039. The reversal of 1245571979 is 9791755421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245571979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1245571939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622785989 + 622785990.

It is an arithmetic number, because the mean of its divisors is an integer number (622785990).

Almost surely, 2^1245571979 is an apocalyptic number.

1245571979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245571979 is an equidigital number, since it uses as much as digits as its factorization.

1245571979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 50.

The square root of 1245571979 is about 35292.6618293378. The cubic root of 1245571979 is about 1075.9438558135.

The spelling of 1245571979 in words is "one billion, two hundred forty-five million, five hundred seventy-one thousand, nine hundred seventy-nine".