1279454749 has 2 divisors, whose sum is σ = 1279454750. Its totient is φ = 1279454748.

The previous prime is 1279454689. The next prime is 1279454789. The reversal of 1279454749 is 9474549721.

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., 1083594724 + 195860025 = 32918^2 + 13995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279454749 - 2⁷ = 1279454621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1279454696 and 1279454705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279454789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639727374 + 639727375.

It is an arithmetic number, because the mean of its divisors is an integer number (639727375).

Almost surely, 2^1279454749 is an apocalyptic number.

It is an amenable number.

1279454749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279454749 is an equidigital number, since it uses as much as digits as its factorization.

1279454749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The square root of 1279454749 is about 35769.4667139447. The cubic root of 1279454749 is about 1085.6128540209.

The spelling of 1279454749 in words is "one billion, two hundred seventy-nine million, four hundred fifty-four thousand, seven hundred forty-nine".