61127881 has 2 divisors, whose sum is σ = 61127882. Its totient is φ = 61127880.

The previous prime is 61127879. The next prime is 61127929. The reversal of 61127881 is 18872116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61089856 + 38025 = 7816^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 61127881 - 2¹ = 61127879 is a prime.

It is a super-2 number, since 2×61127881² = 7473235671100322, which contains 22 as substring.

Together with 61127879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61127821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30563940 + 30563941.

It is an arithmetic number, because the mean of its divisors is an integer number (30563941).

Almost surely, 2^61127881 is an apocalyptic number.

It is an amenable number.

61127881 is a deficient number, since it is larger than the sum of its proper divisors (1).

61127881 is an equidigital number, since it uses as much as digits as its factorization.

61127881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 34.

The square root of 61127881 is about 7818.4321318280. The cubic root of 61127881 is about 393.9246100182.

Adding to 61127881 its reverse (18872116), we get a palindrome (79999997).

The spelling of 61127881 in words is "sixty-one million, one hundred twenty-seven thousand, eight hundred eighty-one".