1540131025 has 6 divisors (see below), whose sum is σ = 1909762502. Its totient is φ = 1232104800.

The previous prime is 1540131007. The next prime is 1540131029. The reversal of 1540131025 is 5201310451.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 139051264 + 1401079761 = 11792^2 + 37431^2 .

It is not a de Polignac number, because 1540131025 - 2¹³ = 1540122833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1540130987 and 1540131005.

It is not an unprimeable number, because it can be changed into a prime (1540131029) 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, 30802596 + ... + 30802645.

Almost surely, 2^1540131025 is an apocalyptic number.

It is an amenable number.

1540131025 is a deficient number, since it is larger than the sum of its proper divisors (369631477).

1540131025 is an equidigital number, since it uses as much as digits as its factorization.

1540131025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61605251 (or 61605246 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1540131025 is about 39244.5031182712. The cubic root of 1540131025 is about 1154.8330999506.

Adding to 1540131025 its reverse (5201310451), we get a palindrome (6741441476).

The spelling of 1540131025 in words is "one billion, five hundred forty million, one hundred thirty-one thousand, twenty-five".