1491404403 has 4 divisors (see below), whose sum is σ = 1988539208. Its totient is φ = 994269600.

The previous prime is 1491404393. The next prime is 1491404429. The reversal of 1491404403 is 3044041941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3044041941 = 3 ⋅1014680647.

It is not a de Polignac number, because 1491404403 - 2⁵ = 1491404371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491404503) 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, 248567398 + ... + 248567403.

It is an arithmetic number, because the mean of its divisors is an integer number (497134802).

Almost surely, 2^1491404403 is an apocalyptic number.

1491404403 is a deficient number, since it is larger than the sum of its proper divisors (497134805).

1491404403 is an equidigital number, since it uses as much as digits as its factorization.

1491404403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497134804.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1491404403 is about 38618.7053511637. The cubic root of 1491404403 is about 1142.5234965250.

The spelling of 1491404403 in words is "one billion, four hundred ninety-one million, four hundred four thousand, four hundred three".