61442143 has 8 divisors (see below), whose sum is σ = 73915520. Its totient is φ = 49892760.

The previous prime is 61442137. The next prime is 61442159. The reversal of 61442143 is 34124416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61442143 - 2⁵ = 61442111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61442123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230853 + ... + 231118.

It is an arithmetic number, because the mean of its divisors is an integer number (9239440).

Almost surely, 2^61442143 is an apocalyptic number.

61442143 is a deficient number, since it is larger than the sum of its proper divisors (12473377).

61442143 is a wasteful number, since it uses less digits than its factorization.

61442143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461997.

The product of its digits is 2304, while the sum is 25.

The square root of 61442143 is about 7838.5038751027. The cubic root of 61442143 is about 394.5985195934.

Adding to 61442143 its reverse (34124416), we get a palindrome (95566559).

The spelling of 61442143 in words is "sixty-one million, four hundred forty-two thousand, one hundred forty-three".