31136543 has 2 divisors, whose sum is σ = 31136544. Its totient is φ = 31136542.

The previous prime is 31136533. The next prime is 31136551. The reversal of 31136543 is 34563113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31136543 - 2¹⁸ = 30874399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31136533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15568271 + 15568272.

It is an arithmetic number, because the mean of its divisors is an integer number (15568272).

Almost surely, 2^31136543 is an apocalyptic number.

31136543 is a deficient number, since it is larger than the sum of its proper divisors (1).

31136543 is an equidigital number, since it uses as much as digits as its factorization.

31136543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 26.

The square root of 31136543 is about 5580.0128136054. The cubic root of 31136543 is about 314.5986085863.

Adding to 31136543 its reverse (34563113), we get a palindrome (65699656).

The spelling of 31136543 in words is "thirty-one million, one hundred thirty-six thousand, five hundred forty-three".