61281977 has 2 divisors, whose sum is σ = 61281978. Its totient is φ = 61281976.

The previous prime is 61281949. The next prime is 61282007. The reversal of 61281977 is 77918216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56490256 + 4791721 = 7516^2 + 2189^2 .

It is a cyclic number.

It is not a de Polignac number, because 61281977 - 2¹⁰ = 61280953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61281917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30640988 + 30640989.

It is an arithmetic number, because the mean of its divisors is an integer number (30640989).

Almost surely, 2^61281977 is an apocalyptic number.

It is an amenable number.

61281977 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281977 is an equidigital number, since it uses as much as digits as its factorization.

61281977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 41.

The square root of 61281977 is about 7828.2805902701. The cubic root of 61281977 is about 394.2553443704.

The spelling of 61281977 in words is "sixty-one million, two hundred eighty-one thousand, nine hundred seventy-seven".