61142681 has 2 divisors, whose sum is σ = 61142682. Its totient is φ = 61142680.

The previous prime is 61142647. The next prime is 61142699. The reversal of 61142681 is 18624116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42133081 + 19009600 = 6491^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 61142681 - 2⁶ = 61142617 is a prime.

It is a super-2 number, since 2×61142681² = 7476854879735522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61142621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30571340 + 30571341.

It is an arithmetic number, because the mean of its divisors is an integer number (30571341).

Almost surely, 2^61142681 is an apocalyptic number.

It is an amenable number.

61142681 is a deficient number, since it is larger than the sum of its proper divisors (1).

61142681 is an equidigital number, since it uses as much as digits as its factorization.

61142681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 61142681 is about 7819.3785558700. The cubic root of 61142681 is about 393.9563991880.

Adding to 61142681 its reverse (18624116), we get a palindrome (79766797).

The spelling of 61142681 in words is "sixty-one million, one hundred forty-two thousand, six hundred eighty-one".