2531156542 has 16 divisors (see below), whose sum is σ = 3827376000. Its totient is φ = 1255396248.

The previous prime is 2531156533. The next prime is 2531156549. The reversal of 2531156542 is 2456511352.

It is a junction number, because it is equal to n+sod(n) for n = 2531156498 and 2531156507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531156549) 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, 159073 + ... + 174259.

It is an arithmetic number, because the mean of its divisors is an integer number (239211000).

Almost surely, 2^2531156542 is an apocalyptic number.

2531156542 is a deficient number, since it is larger than the sum of its proper divisors (1296219458).

2531156542 is a wasteful number, since it uses less digits than its factorization.

2531156542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15855.

The product of its digits is 36000, while the sum is 34.

The square root of 2531156542 is about 50310.6006921007. The cubic root of 2531156542 is about 1362.8236716319.

Adding to 2531156542 its reverse (2456511352), we get a palindrome (4987667894).

The spelling of 2531156542 in words is "two billion, five hundred thirty-one million, one hundred fifty-six thousand, five hundred forty-two".