1172721947 has 2 divisors, whose sum is σ = 1172721948. Its totient is φ = 1172721946.

The previous prime is 1172721941. The next prime is 1172721959. The reversal of 1172721947 is 7491272711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1172721947 - 2⁶ = 1172721883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1172721941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 586360973 + 586360974.

It is an arithmetic number, because the mean of its divisors is an integer number (586360974).

Almost surely, 2^1172721947 is an apocalyptic number.

1172721947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1172721947 is an equidigital number, since it uses as much as digits as its factorization.

1172721947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 41.

The square root of 1172721947 is about 34245.0280624794. The cubic root of 1172721947 is about 1054.5447590024.

The spelling of 1172721947 in words is "one billion, one hundred seventy-two million, seven hundred twenty-one thousand, nine hundred forty-seven".