61646143 has 4 divisors (see below), whose sum is σ = 66388168. Its totient is φ = 56904120.

The previous prime is 61646099. The next prime is 61646147. The reversal of 61646143 is 34164616.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61646143 - 2¹⁷ = 61515071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61646147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2370993 + ... + 2371018.

It is an arithmetic number, because the mean of its divisors is an integer number (16597042).

Almost surely, 2^61646143 is an apocalyptic number.

61646143 is a deficient number, since it is larger than the sum of its proper divisors (4742025).

61646143 is a wasteful number, since it uses less digits than its factorization.

61646143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742024.

The product of its digits is 10368, while the sum is 31.

The square root of 61646143 is about 7851.5057791484. The cubic root of 61646143 is about 395.0347520565.

The spelling of 61646143 in words is "sixty-one million, six hundred forty-six thousand, one hundred forty-three".