1268492891 has 8 divisors (see below), whose sum is σ = 1309668864. Its totient is φ = 1227804480.

The previous prime is 1268492879. The next prime is 1268492899. The reversal of 1268492891 is 1982948621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1268492891 - 2¹⁰ = 1268491867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268492899) 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, 116600 + ... + 127013.

It is an arithmetic number, because the mean of its divisors is an integer number (163708608).

Almost surely, 2^1268492891 is an apocalyptic number.

1268492891 is a deficient number, since it is larger than the sum of its proper divisors (41175973).

1268492891 is a wasteful number, since it uses less digits than its factorization.

1268492891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243781.

The product of its digits is 497664, while the sum is 50.

The square root of 1268492891 is about 35615.9078362464. The cubic root of 1268492891 is about 1082.5035914166.

The spelling of 1268492891 in words is "one billion, two hundred sixty-eight million, four hundred ninety-two thousand, eight hundred ninety-one".