61989877 has 2 divisors, whose sum is σ = 61989878. Its totient is φ = 61989876.

The previous prime is 61989839. The next prime is 61989919. The reversal of 61989877 is 77898916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59197636 + 2792241 = 7694^2 + 1671^2 .

It is a cyclic number.

It is not a de Polignac number, because 61989877 - 2⁷ = 61989749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61989817) 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, 30994938 + 30994939.

It is an arithmetic number, because the mean of its divisors is an integer number (30994939).

Almost surely, 2^61989877 is an apocalyptic number.

It is an amenable number.

61989877 is a deficient number, since it is larger than the sum of its proper divisors (1).

61989877 is an equidigital number, since it uses as much as digits as its factorization.

61989877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 55.

The square root of 61989877 is about 7873.3650366282. The cubic root of 61989877 is about 395.7676190769.

The spelling of 61989877 in words is "sixty-one million, nine hundred eighty-nine thousand, eight hundred seventy-seven".