1249834609 has 3 divisors (see below), whose sum is σ = 1249869963. Its totient is φ = 1249799256.

The previous prime is 1249834561. The next prime is 1249834613. The reversal of 1249834609 is 9064389421.

The square root of 1249834609 is 35353.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1248562225 + 1272384 = 35335^2 + 1128^2 .

It is not a de Polignac number, because 1249834609 - 2¹⁵ = 1249801841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249834639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17677 + ... + 53029.

It is an arithmetic number, because the mean of its divisors is an integer number (416623321).

Almost surely, 2^1249834609 is an apocalyptic number.

1249834609 is the 35353-rd square number.

1249834609 is the 17677-th centered octagonal number.

It is an amenable number.

1249834609 is a deficient number, since it is larger than the sum of its proper divisors (35354).

1249834609 is an frugal number, since it uses more digits than its factorization.

1249834609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70706 (or 35353 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The cubic root of 1249834609 is about 1077.1698330394.

The spelling of 1249834609 in words is "one billion, two hundred forty-nine million, eight hundred thirty-four thousand, six hundred nine".