61271310731 has 2 divisors, whose sum is σ = 61271310732. Its totient is φ = 61271310730.

The previous prime is 61271310721. The next prime is 61271310739. The reversal of 61271310731 is 13701317216.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61271310731 is a prime.

It is a super-2 number, since 2×61271310731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61271310739) 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, 30635655365 + 30635655366.

It is an arithmetic number, because the mean of its divisors is an integer number (30635655366).

Almost surely, 2^61271310731 is an apocalyptic number.

61271310731 is a deficient number, since it is larger than the sum of its proper divisors (1).

61271310731 is an equidigital number, since it uses as much as digits as its factorization.

61271310731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 32.

Adding to 61271310731 its reverse (13701317216), we get a palindrome (74972627947).

The spelling of 61271310731 in words is "sixty-one billion, two hundred seventy-one million, three hundred ten thousand, seven hundred thirty-one".