61281477 has 12 divisors (see below), whose sum is σ = 88593804. Its totient is φ = 40819200.

The previous prime is 61281469. The next prime is 61281487. The reversal of 61281477 is 77418216.

61281477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 39012516 + 22268961 = 6246^2 + 4719^2 .

It is not a de Polignac number, because 61281477 - 2³ = 61281469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61281427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12283 + ... + 16535.

It is an arithmetic number, because the mean of its divisors is an integer number (7382817).

Almost surely, 2^61281477 is an apocalyptic number.

It is an amenable number.

61281477 is a deficient number, since it is larger than the sum of its proper divisors (27312327).

61281477 is a wasteful number, since it uses less digits than its factorization.

61281477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5860 (or 5857 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 61281477 is about 7828.2486547120. The cubic root of 61281477 is about 394.2542721237.

The spelling of 61281477 in words is "sixty-one million, two hundred eighty-one thousand, four hundred seventy-seven".