1247841953 has 2 divisors, whose sum is σ = 1247841954. Its totient is φ = 1247841952.

The previous prime is 1247841943. The next prime is 1247841989. The reversal of 1247841953 is 3591487421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 797893009 + 449948944 = 28247^2 + 21212^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247841953 - 2²⁶ = 1180733089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1247841923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623920976 + 623920977.

It is an arithmetic number, because the mean of its divisors is an integer number (623920977).

Almost surely, 2^1247841953 is an apocalyptic number.

It is an amenable number.

1247841953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247841953 is an equidigital number, since it uses as much as digits as its factorization.

1247841953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 1247841953 is about 35324.8064821309. The cubic root of 1247841953 is about 1076.5970717486.

The spelling of 1247841953 in words is "one billion, two hundred forty-seven million, eight hundred forty-one thousand, nine hundred fifty-three".