1291471678 has 8 divisors (see below), whose sum is σ = 2213951472. Its totient is φ = 553487856.

The previous prime is 1291471663. The next prime is 1291471739. The reversal of 1291471678 is 8761741921.

It is a happy number.

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

It is a super-3 number, since 3×1291471678³ (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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46123975 + ... + 46124002.

It is an arithmetic number, because the mean of its divisors is an integer number (276743934).

Almost surely, 2^1291471678 is an apocalyptic number.

1291471678 is a deficient number, since it is larger than the sum of its proper divisors (922479794).

1291471678 is an equidigital number, since it uses as much as digits as its factorization.

1291471678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92247986.

The product of its digits is 169344, while the sum is 46.

The square root of 1291471678 is about 35937.0516041592. The cubic root of 1291471678 is about 1089.0010425080.

The spelling of 1291471678 in words is "one billion, two hundred ninety-one million, four hundred seventy-one thousand, six hundred seventy-eight".