1230309649 has 4 divisors (see below), whose sum is σ = 1231141860. Its totient is φ = 1229477440.

The previous prime is 1230309631. The next prime is 1230309697. The reversal of 1230309649 is 9469030321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9469030321 = 31 ⋅305452591.

It can be written as a sum of positive squares in 2 ways, for example, as 326886400 + 903423249 = 18080^2 + 30057^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230309649 - 2¹¹ = 1230307601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1230309349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413884 + ... + 416845.

It is an arithmetic number, because the mean of its divisors is an integer number (307785465).

Almost surely, 2^1230309649 is an apocalyptic number.

It is an amenable number.

1230309649 is a deficient number, since it is larger than the sum of its proper divisors (832211).

1230309649 is an equidigital number, since it uses as much as digits as its factorization.

1230309649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832210.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 1230309649 is about 35075.7701127146. The cubic root of 1230309649 is about 1071.5311729105.

The spelling of 1230309649 in words is "one billion, two hundred thirty million, three hundred nine thousand, six hundred forty-nine".