2139450125 has 8 divisors (see below), whose sum is σ = 2670033912. Its totient is φ = 1711560000.

The previous prime is 2139450121. The next prime is 2139450161. The reversal of 2139450125 is 5210549312.

It can be written as a sum of positive squares in 4 ways, for example, as 13410244 + 2126039881 = 3662^2 + 46109^2 .

It is not a de Polignac number, because 2139450125 - 2² = 2139450121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2139450091 and 2139450100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139450121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8557676 + ... + 8557925.

It is an arithmetic number, because the mean of its divisors is an integer number (333754239).

Almost surely, 2^2139450125 is an apocalyptic number.

2139450125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2139450125 is a deficient number, since it is larger than the sum of its proper divisors (530583787).

2139450125 is an equidigital number, since it uses as much as digits as its factorization.

2139450125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17115616 (or 17115606 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 2139450125 is about 46254.1903507131. The cubic root of 2139450125 is about 1288.5483590644.

Adding to 2139450125 its reverse (5210549312), we get a palindrome (7349999437).

The spelling of 2139450125 in words is "two billion, one hundred thirty-nine million, four hundred fifty thousand, one hundred twenty-five".