2499100081 has 3 divisors (see below), whose sum is σ = 2499150073. Its totient is φ = 2499050090.

The previous prime is 2499100069. The next prime is 2499100117. The reversal of 2499100081 is 1800019942.

The square root of 2499100081 is 49991.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2499100081 - 2⁵ = 2499100049 is a prime.

It is a super-2 number, since 2×2499100081² = 12491002429708413122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2499103081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 24996 + ... + 74986.

Almost surely, 2^2499100081 is an apocalyptic number.

2499100081 is the 49991-st square number.

2499100081 is the 24996-th centered octagonal number.

It is an amenable number.

2499100081 is a deficient number, since it is larger than the sum of its proper divisors (49992).

2499100081 is an frugal number, since it uses more digits than its factorization.

2499100081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99982 (or 49991 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The cubic root of 2499100081 is about 1357.0459383541.

Multiplying 2499100081 by its product of nonzero digits (5184), we get a square (12955334819904 = 3599352²).

The spelling of 2499100081 in words is "two billion, four hundred ninety-nine million, one hundred thousand, eighty-one".