2531542640 has 60 divisors (see below), whose sum is σ = 6469580712. Its totient is φ = 920557440.

The previous prime is 2531542619. The next prime is 2531542661. The reversal of 2531542640 is 462451352.

It is an interprime number because it is at equal distance from previous prime (2531542619) and next prime (2531542661).

It is a junction number, because it is equal to n+sod(n) for n = 2531542597 and 2531542606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121082 + ... + 140441.

Almost surely, 2^2531542640 is an apocalyptic number.

2531542640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2531542640 is an abundant number, since it is smaller than the sum of its proper divisors (3938038072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2531542640 is a wasteful number, since it uses less digits than its factorization.

2531542640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261558 (or 261541 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 2531542640 is about 50314.4376893949. The cubic root of 2531542640 is about 1362.8929623208.

Adding to 2531542640 its reverse (462451352), we get a palindrome (2993993992).

The spelling of 2531542640 in words is "two billion, five hundred thirty-one million, five hundred forty-two thousand, six hundred forty".