61310531 has 2 divisors, whose sum is σ = 61310532. Its totient is φ = 61310530.

The previous prime is 61310527. The next prime is 61310569. The reversal of 61310531 is 13501316.

It is a happy number.

61310531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61310531 - 2² = 61310527 is a prime.

It is a super-2 number, since 2×61310531² = 7517962423003922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61310521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30655265 + 30655266.

It is an arithmetic number, because the mean of its divisors is an integer number (30655266).

Almost surely, 2^61310531 is an apocalyptic number.

61310531 is a deficient number, since it is larger than the sum of its proper divisors (1).

61310531 is an equidigital number, since it uses as much as digits as its factorization.

61310531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 61310531 is about 7830.1041500098. The cubic root of 61310531 is about 394.3165685652.

Adding to 61310531 its reverse (13501316), we get a palindrome (74811847).

The spelling of 61310531 in words is "sixty-one million, three hundred ten thousand, five hundred thirty-one".