2542691731 has 4 divisors (see below), whose sum is σ = 2584375264. Its totient is φ = 2501008200.

The previous prime is 2542691729. The next prime is 2542691743. The reversal of 2542691731 is 1371962452.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2542691731 - 2¹ = 2542691729 is a prime.

It is a super-2 number, since 2×2542691731² = 12930562477791552722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2542695731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20841675 + ... + 20841796.

It is an arithmetic number, because the mean of its divisors is an integer number (646093816).

Almost surely, 2^2542691731 is an apocalyptic number.

2542691731 is a deficient number, since it is larger than the sum of its proper divisors (41683533).

2542691731 is an equidigital number, since it uses as much as digits as its factorization.

2542691731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41683532.

The product of its digits is 90720, while the sum is 40.

The square root of 2542691731 is about 50425.1101238262. The cubic root of 2542691731 is about 1364.8907909962.

The spelling of 2542691731 in words is "two billion, five hundred forty-two million, six hundred ninety-one thousand, seven hundred thirty-one".