1491756747 has 48 divisors (see below), whose sum is σ = 2366058240. Its totient is φ = 831752064.

The previous prime is 1491756733. The next prime is 1491756779. The reversal of 1491756747 is 7476571941.

It is not a de Polignac number, because 1491756747 - 2⁷ = 1491756619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1491756747.

It is not an unprimeable number, because it can be changed into a prime (1491756727) 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 47 ways as a sum of consecutive naturals, for example, 218193 + ... + 224925.

It is an arithmetic number, because the mean of its divisors is an integer number (49292880).

Almost surely, 2^1491756747 is an apocalyptic number.

1491756747 is a deficient number, since it is larger than the sum of its proper divisors (874301493).

1491756747 is a wasteful number, since it uses less digits than its factorization.

1491756747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804 (or 6791 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 51.

The square root of 1491756747 is about 38623.2669125749. The cubic root of 1491756747 is about 1142.6134630917.

The spelling of 1491756747 in words is "one billion, four hundred ninety-one million, seven hundred fifty-six thousand, seven hundred forty-seven".