1291709412 has 72 divisors (see below), whose sum is σ = 3776625216. Its totient is φ = 364607424.

The previous prime is 1291709369. The next prime is 1291709431. The reversal of 1291709412 is 2149071921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9963 + ... + 51794.

It is an arithmetic number, because the mean of its divisors is an integer number (52453128).

Almost surely, 2^1291709412 is an apocalyptic number.

1291709412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1291709412 is an abundant number, since it is smaller than the sum of its proper divisors (2484915804).

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

1291709412 is a wasteful number, since it uses less digits than its factorization.

1291709412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61857 (or 61852 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1291709412 is about 35940.3590967035. The cubic root of 1291709412 is about 1089.0678594823.

The spelling of 1291709412 in words is "one billion, two hundred ninety-one million, seven hundred nine thousand, four hundred twelve".