1291454688 has 48 divisors (see below), whose sum is σ = 3409708176. Its totient is φ = 427991040.

The previous prime is 1291454687. The next prime is 1291454701. The reversal of 1291454688 is 8864541921.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1291454688² = 3335710422314354688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291454683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22273 + ... + 55488.

It is an arithmetic number, because the mean of its divisors is an integer number (71035587).

Almost surely, 2^1291454688 is an apocalyptic number.

It is an amenable number.

1291454688 is an abundant number, since it is smaller than the sum of its proper divisors (2118253488).

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

1291454688 is a wasteful number, since it uses less digits than its factorization.

1291454688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77947 (or 77939 counting only the distinct ones).

The product of its digits is 552960, while the sum is 48.

The square root of 1291454688 is about 35936.8152178236. The cubic root of 1291454688 is about 1088.9962670235.

The spelling of 1291454688 in words is "one billion, two hundred ninety-one million, four hundred fifty-four thousand, six hundred eighty-eight".