61318489 has 2 divisors, whose sum is σ = 61318490. Its totient is φ = 61318488.

The previous prime is 61318487. The next prime is 61318519. The reversal of 61318489 is 98481316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33408400 + 27910089 = 5780^2 + 5283^2 .

It is a cyclic number.

It is not a de Polignac number, because 61318489 - 2¹ = 61318487 is a prime.

Together with 61318487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61318487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30659244 + 30659245.

It is an arithmetic number, because the mean of its divisors is an integer number (30659245).

Almost surely, 2^61318489 is an apocalyptic number.

It is an amenable number.

61318489 is a deficient number, since it is larger than the sum of its proper divisors (1).

61318489 is an equidigital number, since it uses as much as digits as its factorization.

61318489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 61318489 is about 7830.6123004526. The cubic root of 61318489 is about 394.3336283614. Note that the first 3 decimals are identical.

The spelling of 61318489 in words is "sixty-one million, three hundred eighteen thousand, four hundred eighty-nine".