1291478478 has 32 divisors (see below), whose sum is σ = 2643853056. Its totient is φ = 420458688.

The previous prime is 1291478477. The next prime is 1291478479. The reversal of 1291478478 is 8748741921.

It is an interprime number because it is at equal distance from previous prime (1291478477) and next prime (1291478479).

It is a self number, because there is not a number n which added to its sum of digits gives 1291478478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291478471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30801 + ... + 59427.

It is an arithmetic number, because the mean of its divisors is an integer number (82620408).

Almost surely, 2^1291478478 is an apocalyptic number.

1291478478 is an abundant number, since it is smaller than the sum of its proper divisors (1352374578).

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

1291478478 is a wasteful number, since it uses less digits than its factorization.

1291478478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28808.

The product of its digits is 903168, while the sum is 51.

The square root of 1291478478 is about 35937.1462139108. The cubic root of 1291478478 is about 1089.0029538144.

The spelling of 1291478478 in words is "one billion, two hundred ninety-one million, four hundred seventy-eight thousand, four hundred seventy-eight".