491505615 has 48 divisors (see below), whose sum is σ = 912319200. Its totient is φ = 243910656.

The previous prime is 491505587. The next prime is 491505617. The reversal of 491505615 is 516505194.

491505615 is a `hidden beast` number, since 4 + 91 + 5 + 0 + 561 + 5 = 666.

It is not a de Polignac number, because 491505615 - 2¹¹ = 491503567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491505615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491505617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64476 + ... + 71694.

It is an arithmetic number, because the mean of its divisors is an integer number (19006650).

Almost surely, 2^491505615 is an apocalyptic number.

491505615 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

491505615 is a deficient number, since it is larger than the sum of its proper divisors (420813585).

491505615 is a wasteful number, since it uses less digits than its factorization.

491505615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7336 (or 7333 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 491505615 is about 22169.9259132727. The cubic root of 491505615 is about 789.1801648259.

The spelling of 491505615 in words is "four hundred ninety-one million, five hundred five thousand, six hundred fifteen".