61278881 has 2 divisors, whose sum is σ = 61278882. Its totient is φ = 61278880.

The previous prime is 61278871. The next prime is 61278907. The reversal of 61278881 is 18887216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59043856 + 2235025 = 7684^2 + 1495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61278881 is a prime.

It is a super-2 number, since 2×61278881² = 7510202513224322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61278871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30639440 + 30639441.

It is an arithmetic number, because the mean of its divisors is an integer number (30639441).

Almost surely, 2^61278881 is an apocalyptic number.

It is an amenable number.

61278881 is a deficient number, since it is larger than the sum of its proper divisors (1).

61278881 is an equidigital number, since it uses as much as digits as its factorization.

61278881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 41.

The square root of 61278881 is about 7828.0828431999. The cubic root of 61278881 is about 394.2487049246.

The spelling of 61278881 in words is "sixty-one million, two hundred seventy-eight thousand, eight hundred eighty-one".