1291289106 has 16 divisors (see below), whose sum is σ = 2582955648. Its totient is φ = 430366800.

The previous prime is 1291289089. The next prime is 1291289107. The reversal of 1291289106 is 6019821921.

It is not an unprimeable number, because it can be changed into a prime (1291289107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49671 + ... + 71061.

It is an arithmetic number, because the mean of its divisors is an integer number (161434728).

Almost surely, 2^1291289106 is an apocalyptic number.

1291289106 is an abundant number, since it is smaller than the sum of its proper divisors (1291666542).

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

1291289106 is a wasteful number, since it uses less digits than its factorization.

1291289106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31457.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 1291289106 is about 35934.5113505109. The cubic root of 1291289106 is about 1088.9497236725.

The spelling of 1291289106 in words is "one billion, two hundred ninety-one million, two hundred eighty-nine thousand, one hundred six".