2541515081 has 4 divisors (see below), whose sum is σ = 2904588672. Its totient is φ = 2178441492.

The previous prime is 2541515057. The next prime is 2541515101. The reversal of 2541515081 is 1805151452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2541515081 - 2⁶ = 2541515017 is a prime.

It is a super-2 number, since 2×2541515081² = 12918597813900873122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2541515281) 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 3 ways as a sum of consecutive naturals, for example, 181536785 + ... + 181536798.

It is an arithmetic number, because the mean of its divisors is an integer number (726147168).

Almost surely, 2^2541515081 is an apocalyptic number.

It is an amenable number.

2541515081 is a deficient number, since it is larger than the sum of its proper divisors (363073591).

2541515081 is an equidigital number, since it uses as much as digits as its factorization.

2541515081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363073590.

The product of its (nonzero) digits is 8000, while the sum is 32.

The square root of 2541515081 is about 50413.4414714965. The cubic root of 2541515081 is about 1364.6802206359.

The spelling of 2541515081 in words is "two billion, five hundred forty-one million, five hundred fifteen thousand, eighty-one".