2491398725 has 6 divisors (see below), whose sum is σ = 3089334450. Its totient is φ = 1993118960.

The previous prime is 2491398673. The next prime is 2491398727. The reversal of 2491398725 is 5278931942.

It can be written as a sum of positive squares in 3 ways, for example, as 867066916 + 1624331809 = 29446^2 + 40303^2 .

It is not a de Polignac number, because 2491398725 - 2³⁰ = 1417656901 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491398727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49827950 + ... + 49827999.

It is an arithmetic number, because the mean of its divisors is an integer number (514889075).

Almost surely, 2^2491398725 is an apocalyptic number.

2491398725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2491398725 is a deficient number, since it is larger than the sum of its proper divisors (597935725).

2491398725 is an equidigital number, since it uses as much as digits as its factorization.

2491398725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99655959 (or 99655954 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 50.

The square root of 2491398725 is about 49913.9131405263. The cubic root of 2491398725 is about 1355.6505230044.

The spelling of 2491398725 in words is "two billion, four hundred ninety-one million, three hundred ninety-eight thousand, seven hundred twenty-five".