61857443 has 4 divisors (see below), whose sum is σ = 62404968. Its totient is φ = 61309920.

The previous prime is 61857437. The next prime is 61857457. The reversal of 61857443 is 34475816.

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

It is a cyclic number.

It is not a de Polignac number, because 61857443 - 2²⁴ = 45080227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61857397 and 61857406.

It is not an unprimeable number, because it can be changed into a prime (61857043) 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, 273593 + ... + 273818.

It is an arithmetic number, because the mean of its divisors is an integer number (15601242).

Almost surely, 2^61857443 is an apocalyptic number.

61857443 is a deficient number, since it is larger than the sum of its proper divisors (547525).

61857443 is a wasteful number, since it uses less digits than its factorization.

61857443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547524.

The product of its digits is 80640, while the sum is 38.

The square root of 61857443 is about 7864.9502859204. The cubic root of 61857443 is about 395.4855813177.

The spelling of 61857443 in words is "sixty-one million, eight hundred fifty-seven thousand, four hundred forty-three".