1291425998 has 16 divisors (see below), whose sum is σ = 1970967600. Its totient is φ = 634459200.

The previous prime is 1291425997. The next prime is 1291426001. The reversal of 1291425998 is 8995241921.

It is a super-3 number, since 3×1291425998³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291425997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122933 + ... + 133023.

It is an arithmetic number, because the mean of its divisors is an integer number (123185475).

Almost surely, 2^1291425998 is an apocalyptic number.

1291425998 is a deficient number, since it is larger than the sum of its proper divisors (679541602).

1291425998 is a wasteful number, since it uses less digits than its factorization.

1291425998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11203.

The product of its digits is 466560, while the sum is 50.

The square root of 1291425998 is about 35936.4160427831. The cubic root of 1291425998 is about 1088.9882028526.

The spelling of 1291425998 in words is "one billion, two hundred ninety-one million, four hundred twenty-five thousand, nine hundred ninety-eight".