491478615 has 12 divisors (see below), whose sum is σ = 851896344. Its totient is φ = 262121904.

The previous prime is 491478613. The next prime is 491478623. The reversal of 491478615 is 516874194.

It is not a de Polignac number, because 491478615 - 2¹ = 491478613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 10921747 = 491478615 / (4 + 9 + 1 + 4 + 7 + 8 + 6 + 1 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491478613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5460829 + ... + 5460918.

It is an arithmetic number, because the mean of its divisors is an integer number (70991362).

Almost surely, 2^491478615 is an apocalyptic number.

491478615 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

491478615 is a deficient number, since it is larger than the sum of its proper divisors (360417729).

491478615 is a wasteful number, since it uses less digits than its factorization.

491478615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10921758 (or 10921755 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 491478615 is about 22169.3169718871. The cubic root of 491478615 is about 789.1657138180.

The spelling of 491478615 in words is "four hundred ninety-one million, four hundred seventy-eight thousand, six hundred fifteen".