61418681 has 2 divisors, whose sum is σ = 61418682. Its totient is φ = 61418680.

The previous prime is 61418677. The next prime is 61418683. The reversal of 61418681 is 18681416.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59290000 + 2128681 = 7700^2 + 1459^2 .

It is a cyclic number.

It is not a de Polignac number, because 61418681 - 2² = 61418677 is a prime.

It is a super-2 number, since 2×61418681² = 7544508751559522, which contains 22 as substring.

Together with 61418683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61418683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30709340 + 30709341.

It is an arithmetic number, because the mean of its divisors is an integer number (30709341).

Almost surely, 2^61418681 is an apocalyptic number.

It is an amenable number.

61418681 is a deficient number, since it is larger than the sum of its proper divisors (1).

61418681 is an equidigital number, since it uses as much as digits as its factorization.

61418681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 35.

The square root of 61418681 is about 7837.0071455882. The cubic root of 61418681 is about 394.5482867040.

The spelling of 61418681 in words is "sixty-one million, four hundred eighteen thousand, six hundred eighty-one".