1266143491 has 8 divisors (see below), whose sum is σ = 1321991424. Its totient is φ = 1210362120.

The previous prime is 1266143477. The next prime is 1266143513. The reversal of 1266143491 is 1943416621.

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

It is not a de Polignac number, because 1266143491 - 2⁹ = 1266142979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1266143491.

It is not an unprimeable number, because it can be changed into a prime (1266143401) 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, 24426 + ... + 55936.

It is an arithmetic number, because the mean of its divisors is an integer number (165248928).

Almost surely, 2^1266143491 is an apocalyptic number.

1266143491 is a deficient number, since it is larger than the sum of its proper divisors (55847933).

1266143491 is a wasteful number, since it uses less digits than its factorization.

1266143491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33281.

The product of its digits is 31104, while the sum is 37.

The square root of 1266143491 is about 35582.9100974049. The cubic root of 1266143491 is about 1081.8348698448.

The spelling of 1266143491 in words is "one billion, two hundred sixty-six million, one hundred forty-three thousand, four hundred ninety-one".