1291771104 has 72 divisors (see below), whose sum is σ = 3671848152. Its totient is φ = 397463040.

The previous prime is 1291771079. The next prime is 1291771123. The reversal of 1291771104 is 4011771921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23587 + ... + 56034.

It is an arithmetic number, because the mean of its divisors is an integer number (50997891).

Almost surely, 2^1291771104 is an apocalyptic number.

It is an amenable number.

1291771104 is an abundant number, since it is smaller than the sum of its proper divisors (2380077048).

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

1291771104 is a wasteful number, since it uses less digits than its factorization.

1291771104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79660 (or 79639 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 33.

The square root of 1291771104 is about 35941.2173416539. The cubic root of 1291771104 is about 1089.0851971550.

The spelling of 1291771104 in words is "one billion, two hundred ninety-one million, seven hundred seventy-one thousand, one hundred four".