61531426273 has 2 divisors, whose sum is σ = 61531426274. Its totient is φ = 61531426272.

The previous prime is 61531426259. The next prime is 61531426321. The reversal of 61531426273 is 37262413516.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48731445504 + 12799980769 = 220752^2 + 113137^2 .

It is a cyclic number.

It is not a de Polignac number, because 61531426273 - 2²⁹ = 60994555361 is a prime.

It is a super-2 number, since 2×61531426273² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61531420273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30765713136 + 30765713137.

It is an arithmetic number, because the mean of its divisors is an integer number (30765713137).

Almost surely, 2^61531426273 is an apocalyptic number.

It is an amenable number.

61531426273 is a deficient number, since it is larger than the sum of its proper divisors (1).

61531426273 is an equidigital number, since it uses as much as digits as its factorization.

61531426273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 40.

Adding to 61531426273 its reverse (37262413516), we get a palindrome (98793839789).

The spelling of 61531426273 in words is "sixty-one billion, five hundred thirty-one million, four hundred twenty-six thousand, two hundred seventy-three".