1291106943 has 48 divisors (see below), whose sum is σ = 2248646400. Its totient is φ = 697351680.

The previous prime is 1291106923. The next prime is 1291106953. The reversal of 1291106943 is 3496011921.

It is a happy number.

It is not a de Polignac number, because 1291106943 - 2¹² = 1291102847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291106898 and 1291106907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291106923) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 682543 + ... + 684431.

It is an arithmetic number, because the mean of its divisors is an integer number (46846800).

Almost surely, 2^1291106943 is an apocalyptic number.

1291106943 is a deficient number, since it is larger than the sum of its proper divisors (957539457).

1291106943 is a wasteful number, since it uses less digits than its factorization.

1291106943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492 (or 2489 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1291106943 is about 35931.9766085864. The cubic root of 1291106943 is about 1088.8985149808.

The spelling of 1291106943 in words is "one billion, two hundred ninety-one million, one hundred six thousand, nine hundred forty-three".