61321143 has 24 divisors (see below), whose sum is σ = 89713920. Its totient is φ = 37234080.

The previous prime is 61321129. The next prime is 61321163. The reversal of 61321143 is 34112316.

It is not a de Polignac number, because 61321143 - 2⁶ = 61321079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61321103) 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 in 23 ways as a sum of consecutive naturals, for example, 39288 + ... + 40818.

It is an arithmetic number, because the mean of its divisors is an integer number (3738080).

Almost surely, 2^61321143 is an apocalyptic number.

61321143 is a deficient number, since it is larger than the sum of its proper divisors (28392777).

61321143 is a wasteful number, since it uses less digits than its factorization.

61321143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639 (or 1626 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 61321143 is about 7830.7817617400. The cubic root of 61321143 is about 394.3393174903.

Adding to 61321143 its reverse (34112316), we get a palindrome (95433459).

The spelling of 61321143 in words is "sixty-one million, three hundred twenty-one thousand, one hundred forty-three".