61914989 has 2 divisors, whose sum is σ = 61914990. Its totient is φ = 61914988.

The previous prime is 61914899. The next prime is 61914997. The reversal of 61914989 is 98941916.

Together with previous prime (61914899) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59136100 + 2778889 = 7690^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 61914989 - 2²⁰ = 60866413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61904989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30957494 + 30957495.

It is an arithmetic number, because the mean of its divisors is an integer number (30957495).

Almost surely, 2^61914989 is an apocalyptic number.

It is an amenable number.

61914989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61914989 is an equidigital number, since it uses as much as digits as its factorization.

61914989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 61914989 is about 7868.6078184136. The cubic root of 61914989 is about 395.6081834297.

The spelling of 61914989 in words is "sixty-one million, nine hundred fourteen thousand, nine hundred eighty-nine".