2499961 has 4 divisors (see below), whose sum is σ = 2505124. Its totient is φ = 2494800.

The previous prime is 2499953. The next prime is 2499967. The reversal of 2499961 is 1699942.

2499961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 962361 + 1537600 = 981^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 2499961 - 2³ = 2499953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2499967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1770 + ... + 2851.

It is an arithmetic number, because the mean of its divisors is an integer number (626281).

2^2499961 is an apocalyptic number.

It is an amenable number.

2499961 is a deficient number, since it is larger than the sum of its proper divisors (5163).

2499961 is an equidigital number, since it uses as much as digits as its factorization.

2499961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5162.

The product of its digits is 34992, while the sum is 40.

The square root of 2499961 is about 1581.1264971532. The cubic root of 2499961 is about 135.7201750775.

The spelling of 2499961 in words is "two million, four hundred ninety-nine thousand, nine hundred sixty-one".