61731223 has 2 divisors, whose sum is σ = 61731224. Its totient is φ = 61731222.

The previous prime is 61731221. The next prime is 61731251. The reversal of 61731223 is 32213716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61731223 - 2¹ = 61731221 is a prime.

Together with 61731221, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61731221) 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 as a sum of consecutive naturals, namely, 30865611 + 30865612.

It is an arithmetic number, because the mean of its divisors is an integer number (30865612).

Almost surely, 2^61731223 is an apocalyptic number.

61731223 is a deficient number, since it is larger than the sum of its proper divisors (1).

61731223 is an equidigital number, since it uses as much as digits as its factorization.

61731223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 61731223 is about 7856.9219800123. The cubic root of 61731223 is about 395.2164022782.

Adding to 61731223 its reverse (32213716), we get a palindrome (93944939).

It can be divided in two parts, 6173 and 1223, that added together give a square (7396 = 86²).

The spelling of 61731223 in words is "sixty-one million, seven hundred thirty-one thousand, two hundred twenty-three".