2154123025 has 6 divisors (see below), whose sum is σ = 2671112582. Its totient is φ = 1723298400.

The previous prime is 2154123019. The next prime is 2154123047. The reversal of 2154123025 is 5203214512.

It can be written as a sum of positive squares in 3 ways, for example, as 346257664 + 1807865361 = 18608^2 + 42519^2 .

It is not a de Polignac number, because 2154123025 - 2⁷ = 2154122897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 86164921 = 2154123025 / (2 + 1 + 5 + 4 + 1 + 2 + 3 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43082436 + ... + 43082485.

Almost surely, 2^2154123025 is an apocalyptic number.

2154123025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2154123025 is a deficient number, since it is larger than the sum of its proper divisors (516989557).

2154123025 is an equidigital number, since it uses as much as digits as its factorization.

2154123025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86164931 (or 86164926 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 2154123025 is about 46412.5309049183. The cubic root of 2154123025 is about 1291.4873825855.

Adding to 2154123025 its reverse (5203214512), we get a palindrome (7357337537).

The spelling of 2154123025 in words is "two billion, one hundred fifty-four million, one hundred twenty-three thousand, twenty-five".