61705231 has 8 divisors (see below), whose sum is σ = 70584224. Its totient is φ = 52842240.

The previous prime is 61705229. The next prime is 61705247. The reversal of 61705231 is 13250716.

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 61705231 - 2¹ = 61705229 is a prime.

It is a super-2 number, since 2×61705231² = 7615071065526722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61705196 and 61705205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61705201) 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, 5911 + ... + 12583.

It is an arithmetic number, because the mean of its divisors is an integer number (8823028).

Almost surely, 2^61705231 is an apocalyptic number.

61705231 is a deficient number, since it is larger than the sum of its proper divisors (8878993).

61705231 is a wasteful number, since it uses less digits than its factorization.

61705231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8001.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 61705231 is about 7855.2677229996. The cubic root of 61705231 is about 395.1609257230.

Adding to 61705231 its reverse (13250716), we get a palindrome (74955947).

The spelling of 61705231 in words is "sixty-one million, seven hundred five thousand, two hundred thirty-one".