1291225798 has 8 divisors (see below), whose sum is σ = 1937455992. Its totient is φ = 645407136.

The previous prime is 1291225781. The next prime is 1291225811. The reversal of 1291225798 is 8975221921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1291225798² = 3334528122841473608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94915 + ... + 107662.

It is an arithmetic number, because the mean of its divisors is an integer number (242181999).

Almost surely, 2^1291225798 is an apocalyptic number.

1291225798 is a deficient number, since it is larger than the sum of its proper divisors (646230194).

1291225798 is a wasteful number, since it uses less digits than its factorization.

1291225798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205766.

The product of its digits is 181440, while the sum is 46.

The square root of 1291225798 is about 35933.6304595013. The cubic root of 1291225798 is about 1088.9319274110.

The spelling of 1291225798 in words is "one billion, two hundred ninety-one million, two hundred twenty-five thousand, seven hundred ninety-eight".