1291067064 has 96 divisors (see below), whose sum is σ = 4081259520. Its totient is φ = 361021248.

The previous prime is 1291067003. The next prime is 1291067189. The reversal of 1291067064 is 4607601921.

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

It is a congruent number.

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, 3564 + ... + 50939.

It is an arithmetic number, because the mean of its divisors is an integer number (42513120).

Almost surely, 2^1291067064 is an apocalyptic number.

1291067064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291067064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2040629760).

1291067064 is an abundant number, since it is smaller than the sum of its proper divisors (2790192456).

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

1291067064 is a wasteful number, since it uses less digits than its factorization.

1291067064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54569 (or 54562 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1291067064 is about 35931.4216807518. The cubic root of 1291067064 is about 1088.8873037662.

Adding to 1291067064 its reverse (4607601921), we get a palindrome (5898668985).

The spelling of 1291067064 in words is "one billion, two hundred ninety-one million, sixty-seven thousand, sixty-four".