61684281 has 16 divisors (see below), whose sum is σ = 92108800. Its totient is φ = 40796784.

The previous prime is 61684261. The next prime is 61684297. The reversal of 61684281 is 18248616.

It is a de Polignac number, because none of the positive numbers 2^k-61684281 is a prime.

It is a super-2 number, since 2×61684281² = 7609901044973922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61684261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5566 + ... + 12423.

It is an arithmetic number, because the mean of its divisors is an integer number (5756800).

Almost surely, 2^61684281 is an apocalyptic number.

It is an amenable number.

61684281 is a deficient number, since it is larger than the sum of its proper divisors (30424519).

61684281 is a wasteful number, since it uses less digits than its factorization.

61684281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18125 (or 18119 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 61684281 is about 7853.9341097312. The cubic root of 61684281 is about 395.1161993232.

The spelling of 61684281 in words is "sixty-one million, six hundred eighty-four thousand, two hundred eighty-one".