1289429091 has 16 divisors (see below), whose sum is σ = 2010806400. Its totient is φ = 814375944.

The previous prime is 1289429081. The next prime is 1289429123. The reversal of 1289429091 is 1909249821.

It is not a de Polignac number, because 1289429091 - 2⁶ = 1289429027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1289429081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1256241 + ... + 1257266.

It is an arithmetic number, because the mean of its divisors is an integer number (125675400).

Almost surely, 2^1289429091 is an apocalyptic number.

1289429091 is a deficient number, since it is larger than the sum of its proper divisors (721377309).

1289429091 is a wasteful number, since it uses less digits than its factorization.

1289429091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513535 (or 2513529 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1289429091 is about 35908.6214021090. The cubic root of 1289429091 is about 1088.4266195114.

The spelling of 1289429091 in words is "one billion, two hundred eighty-nine million, four hundred twenty-nine thousand, ninety-one".