1291964893 has 4 divisors (see below), whose sum is σ = 1292957728. Its totient is φ = 1290972060.

The previous prime is 1291964867. The next prime is 1291964903. The reversal of 1291964893 is 3984691921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1291964893 - 2⁹ = 1291964381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1291964893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291964833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494463 + ... + 497068.

It is an arithmetic number, because the mean of its divisors is an integer number (323239432).

Almost surely, 2^1291964893 is an apocalyptic number.

It is an amenable number.

1291964893 is a deficient number, since it is larger than the sum of its proper divisors (992835).

1291964893 is an equidigital number, since it uses as much as digits as its factorization.

1291964893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992834.

The product of its digits is 839808, while the sum is 52.

The square root of 1291964893 is about 35943.9131564720. The cubic root of 1291964893 is about 1089.1396552494.

The spelling of 1291964893 in words is "one billion, two hundred ninety-one million, nine hundred sixty-four thousand, eight hundred ninety-three".