1254405689 has 2 divisors, whose sum is σ = 1254405690. Its totient is φ = 1254405688.

The previous prime is 1254405641. The next prime is 1254405697. The reversal of 1254405689 is 9865044521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 754436089 + 499969600 = 27467^2 + 22360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1254405689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1254405629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627202844 + 627202845.

It is an arithmetic number, because the mean of its divisors is an integer number (627202845).

Almost surely, 2^1254405689 is an apocalyptic number.

It is an amenable number.

1254405689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254405689 is an equidigital number, since it uses as much as digits as its factorization.

1254405689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 1254405689 is about 35417.5901071770. The cubic root of 1254405689 is about 1078.4814302947.

The spelling of 1254405689 in words is "one billion, two hundred fifty-four million, four hundred five thousand, six hundred eighty-nine".