2491527578 has 12 divisors (see below), whose sum is σ = 3906848778. Its totient is φ = 1191599640.

The previous prime is 2491527569. The next prime is 2491527581. The reversal of 2491527578 is 8757251942.

It can be written as a sum of positive squares in only one way, i.e., 2397767089 + 93760489 = 48967^2 + 9683^2 .

It is a super-4 number, since 4×2491527578⁴ (a number of 39 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1176413 + ... + 1178528.

Almost surely, 2^2491527578 is an apocalyptic number.

2491527578 is a deficient number, since it is larger than the sum of its proper divisors (1415321200).

2491527578 is a wasteful number, since it uses less digits than its factorization.

2491527578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354989 (or 2354966 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 50.

The square root of 2491527578 is about 49915.2038761738. The cubic root of 2491527578 is about 1355.6738936280.

The spelling of 2491527578 in words is "two billion, four hundred ninety-one million, five hundred twenty-seven thousand, five hundred seventy-eight".