1491631755 has 32 divisors (see below), whose sum is σ = 2419718400. Its totient is φ = 784570752.

The previous prime is 1491631721. The next prime is 1491631789. The reversal of 1491631755 is 5571361941.

It is an interprime number because it is at equal distance from previous prime (1491631721) and next prime (1491631789).

It is not a de Polignac number, because 1491631755 - 2⁹ = 1491631243 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 369136 + ... + 373154.

It is an arithmetic number, because the mean of its divisors is an integer number (75616200).

Almost surely, 2^1491631755 is an apocalyptic number.

1491631755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1491631755 is a deficient number, since it is larger than the sum of its proper divisors (928086645).

1491631755 is a wasteful number, since it uses less digits than its factorization.

1491631755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4363.

The product of its digits is 113400, while the sum is 42.

The square root of 1491631755 is about 38621.6487866585. The cubic root of 1491631755 is about 1142.5815495930.

The spelling of 1491631755 in words is "one billion, four hundred ninety-one million, six hundred thirty-one thousand, seven hundred fifty-five".