61305261 has 8 divisors (see below), whose sum is σ = 82583424. Its totient is φ = 40448640.

The previous prime is 61305239. The next prime is 61305271. The reversal of 61305261 is 16250316.

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

It is not a de Polignac number, because 61305261 - 2¹⁵ = 61272493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61305221) 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, 105045 + ... + 105626.

It is an arithmetic number, because the mean of its divisors is an integer number (10322928).

Almost surely, 2^61305261 is an apocalyptic number.

It is an amenable number.

61305261 is a deficient number, since it is larger than the sum of its proper divisors (21278163).

61305261 is a wasteful number, since it uses less digits than its factorization.

61305261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210771.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 61305261 is about 7829.7676210728. The cubic root of 61305261 is about 394.3052703003.

Adding to 61305261 its reverse (16250316), we get a palindrome (77555577).

The spelling of 61305261 in words is "sixty-one million, three hundred five thousand, two hundred sixty-one".