1291104405 has 24 divisors (see below), whose sum is σ = 2271321312. Its totient is φ = 678309984.

The previous prime is 1291104403. The next prime is 1291104407. The reversal of 1291104405 is 5044011921.

It is an interprime number because it is at equal distance from previous prime (1291104403) and next prime (1291104407).

It is not a de Polignac number, because 1291104405 - 2¹ = 1291104403 is a prime.

It is a super-2 number, since 2×1291104405² = 3333901169220808050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291104401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211099 + ... + 217128.

It is an arithmetic number, because the mean of its divisors is an integer number (94638388).

Almost surely, 2^1291104405 is an apocalyptic number.

1291104405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1291104405 is a deficient number, since it is larger than the sum of its proper divisors (980216907).

1291104405 is a wasteful number, since it uses less digits than its factorization.

1291104405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428305 (or 428302 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1291104405 is about 35931.9412918367. The cubic root of 1291104405 is about 1088.8978014777.

The spelling of 1291104405 in words is "one billion, two hundred ninety-one million, one hundred four thousand, four hundred five".