61305143 has 8 divisors (see below), whose sum is σ = 65459328. Its totient is φ = 57275064.

The previous prime is 61305131. The next prime is 61305149. The reversal of 61305143 is 34150316.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61305143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61305149) 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, 30005 + ... + 31982.

It is an arithmetic number, because the mean of its divisors is an integer number (8182416).

Almost surely, 2^61305143 is an apocalyptic number.

61305143 is a deficient number, since it is larger than the sum of its proper divisors (4154185).

61305143 is a wasteful number, since it uses less digits than its factorization.

61305143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62053.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 61305143 is about 7829.7600857242. The cubic root of 61305143 is about 394.3050173147.

Adding to 61305143 its reverse (34150316), we get a palindrome (95455459).

The spelling of 61305143 in words is "sixty-one million, three hundred five thousand, one hundred forty-three".