1291628834 has 4 divisors (see below), whose sum is σ = 1937443254. Its totient is φ = 645814416.

The previous prime is 1291628827. The next prime is 1291628867. The reversal of 1291628834 is 4388261921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 668377609 + 623251225 = 25853^2 + 24965^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322907207 + ... + 322907210.

Almost surely, 2^1291628834 is an apocalyptic number.

1291628834 is a deficient number, since it is larger than the sum of its proper divisors (645814420).

1291628834 is an equidigital number, since it uses as much as digits as its factorization.

1291628834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645814419.

The product of its digits is 165888, while the sum is 44.

The square root of 1291628834 is about 35939.2380831870. The cubic root of 1291628834 is about 1089.0452133325.

The spelling of 1291628834 in words is "one billion, two hundred ninety-one million, six hundred twenty-eight thousand, eight hundred thirty-four".