1428263940491 has 4 divisors (see below), whose sum is σ = 1428266952984. Its totient is φ = 1428260928000.

The previous prime is 1428263940449. The next prime is 1428263940527. The reversal of 1428263940491 is 1940493628241.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428263940491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428263940431) 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, 622070 + ... + 1800971.

It is an arithmetic number, because the mean of its divisors is an integer number (357066738246).

Almost surely, 2^{1428263940491} is an apocalyptic number.

1428263940491 is a deficient number, since it is larger than the sum of its proper divisors (3012493).

1428263940491 is an equidigital number, since it uses as much as digits as its factorization.

1428263940491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012492.

The product of its (nonzero) digits is 2985984, while the sum is 53.

The spelling of 1428263940491 in words is "one trillion, four hundred twenty-eight billion, two hundred sixty-three million, nine hundred forty thousand, four hundred ninety-one".