2499999999 has 16 divisors (see below), whose sum is σ = 3811200000. Its totient is φ = 1427942880.

The previous prime is 2499999977. The next prime is 2500000001. The reversal of 2499999999 is 9999999942.

It is a Cunningham number, because it is equal to 50000²-1.

It is not a de Polignac number, because 2499999999 - 2⁵ = 2499999967 is a prime.

2499999999 is a modest number, since divided by 99999 gives 24999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2499999959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25002 + ... + 75000.

It is an arithmetic number, because the mean of its divisors is an integer number (238200000).

Almost surely, 2^2499999999 is an apocalyptic number.

2499999999 is a deficient number, since it is larger than the sum of its proper divisors (1311200001).

2499999999 is a wasteful number, since it uses less digits than its factorization.

2499999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52390.

The product of its digits is 344373768, while the sum is 78.

The square root of 2499999999 is about 49999.9999900000. Note that the first 5 decimals coincide. The cubic root of 2499999999 is about 1357.2088081165.

The spelling of 2499999999 in words is "two billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".