61305255 has 84 divisors (see below), whose sum is σ = 122109960. Its totient is φ = 29509920.

The previous prime is 61305239. The next prime is 61305271. The reversal of 61305255 is 55250316.

61305255 is a `hidden beast` number, since 6 + 130 + 525 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (61305239) and next prime (61305271).

It is not a de Polignac number, because 61305255 - 2⁴ = 61305239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 440976 + ... + 441114.

It is an arithmetic number, because the mean of its divisors is an integer number (1453690).

Almost surely, 2^61305255 is an apocalyptic number.

61305255 is a deficient number, since it is larger than the sum of its proper divisors (60804705).

61305255 is a wasteful number, since it uses less digits than its factorization.

61305255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 61305255 is about 7829.7672379197. The cubic root of 61305255 is about 394.3052574367.

The spelling of 61305255 in words is "sixty-one million, three hundred five thousand, two hundred fifty-five".