1291031298 has 42 divisors (see below), whose sum is σ = 2906581017. Its totient is φ = 429886440.

The previous prime is 1291031237. The next prime is 1291031321. The reversal of 1291031298 is 8921301921.

It can be written as a sum of positive squares in 2 ways, for example, as 1272134889 + 18896409 = 35667^2 + 4347^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25407.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 1371508 + ... + 1372448.

Almost surely, 2^1291031298 is an apocalyptic number.

1291031298 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291031298

1291031298 is an abundant number, since it is smaller than the sum of its proper divisors (1615549719).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291031298 is an frugal number, since it uses more digits than its factorization.

1291031298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902 (or 946 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 1291031298 is about 35930.9239792132. The cubic root of 1291031298 is about 1088.8772486461.

The spelling of 1291031298 in words is "one billion, two hundred ninety-one million, thirty-one thousand, two hundred ninety-eight".