1406563491 has 4 divisors (see below), whose sum is σ = 1875417992. Its totient is φ = 937708992.

The previous prime is 1406563453. The next prime is 1406563511. The reversal of 1406563491 is 1943656041.

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

It is not a de Polignac number, because 1406563491 - 2²⁵ = 1373009059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1406563451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234427246 + ... + 234427251.

It is an arithmetic number, because the mean of its divisors is an integer number (468854498).

Almost surely, 2^1406563491 is an apocalyptic number.

1406563491 is a deficient number, since it is larger than the sum of its proper divisors (468854501).

1406563491 is an equidigital number, since it uses as much as digits as its factorization.

1406563491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468854500.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1406563491 is about 37504.1796470740. The cubic root of 1406563491 is about 1120.4344326051.

The spelling of 1406563491 in words is "one billion, four hundred six million, five hundred sixty-three thousand, four hundred ninety-one".