1247954249 has 2 divisors, whose sum is σ = 1247954250. Its totient is φ = 1247954248.

The previous prime is 1247954237. The next prime is 1247954251. The reversal of 1247954249 is 9424597421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 844948624 + 403005625 = 29068^2 + 20075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1247954249 is a prime.

Together with 1247954251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1247954749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623977124 + 623977125.

It is an arithmetic number, because the mean of its divisors is an integer number (623977125).

Almost surely, 2^1247954249 is an apocalyptic number.

It is an amenable number.

1247954249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247954249 is an equidigital number, since it uses as much as digits as its factorization.

1247954249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 1247954249 is about 35326.3959242943. The cubic root of 1247954249 is about 1076.6293658806.

The spelling of 1247954249 in words is "one billion, two hundred forty-seven million, nine hundred fifty-four thousand, two hundred forty-nine".