61142143 has 2 divisors, whose sum is σ = 61142144. Its totient is φ = 61142142.

The previous prime is 61142131. The next prime is 61142161. The reversal of 61142143 is 34124116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61142143 - 2⁹ = 61141631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61143143) 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, 30571071 + 30571072.

It is an arithmetic number, because the mean of its divisors is an integer number (30571072).

Almost surely, 2^61142143 is an apocalyptic number.

61142143 is a deficient number, since it is larger than the sum of its proper divisors (1).

61142143 is an equidigital number, since it uses as much as digits as its factorization.

61142143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 61142143 is about 7819.3441540835. The cubic root of 61142143 is about 393.9552436986.

Adding to 61142143 its reverse (34124116), we get a palindrome (95266259).

The spelling of 61142143 in words is "sixty-one million, one hundred forty-two thousand, one hundred forty-three".