61281405 has 12 divisors (see below), whose sum is σ = 106221180. Its totient is φ = 32683392.

The previous prime is 61281401. The next prime is 61281419. The reversal of 61281405 is 50418216.

61281405 is a `hidden beast` number, since 612 + 8 + 1 + 40 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 40678884 + 20602521 = 6378^2 + 4539^2 .

It is not a de Polignac number, because 61281405 - 2² = 61281401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61281401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 680860 + ... + 680949.

It is an arithmetic number, because the mean of its divisors is an integer number (8851765).

Almost surely, 2^61281405 is an apocalyptic number.

It is an amenable number.

61281405 is a deficient number, since it is larger than the sum of its proper divisors (44939775).

61281405 is a wasteful number, since it uses less digits than its factorization.

61281405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361820 (or 1361817 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 61281405 is about 7828.2440559809. The cubic root of 61281405 is about 394.2541177196.

The spelling of 61281405 in words is "sixty-one million, two hundred eighty-one thousand, four hundred five".