1491869447 has 4 divisors (see below), whose sum is σ = 1556733360. Its totient is φ = 1427005536.

The previous prime is 1491869443. The next prime is 1491869461. The reversal of 1491869447 is 7449681941.

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

It is a cyclic number.

It is not a de Polignac number, because 1491869447 - 2² = 1491869443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491869443) 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, 32431922 + ... + 32431967.

It is an arithmetic number, because the mean of its divisors is an integer number (389183340).

Almost surely, 2^1491869447 is an apocalyptic number.

1491869447 is a deficient number, since it is larger than the sum of its proper divisors (64863913).

1491869447 is an equidigital number, since it uses as much as digits as its factorization.

1491869447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64863912.

The product of its digits is 1741824, while the sum is 53.

The square root of 1491869447 is about 38624.7258501598. The cubic root of 1491869447 is about 1142.6422366155.

The spelling of 1491869447 in words is "one billion, four hundred ninety-one million, eight hundred sixty-nine thousand, four hundred forty-seven".