61766989 has 2 divisors, whose sum is σ = 61766990. Its totient is φ = 61766988.

The previous prime is 61766987. The next prime is 61767059. The reversal of 61766989 is 98966716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51236964 + 10530025 = 7158^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 61766989 - 2¹ = 61766987 is a prime.

It is a super-2 number, since 2×61766989² = 7630321860252242, which contains 22 as substring.

Together with 61766987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61766987) 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, 30883494 + 30883495.

It is an arithmetic number, because the mean of its divisors is an integer number (30883495).

Almost surely, 2^61766989 is an apocalyptic number.

It is an amenable number.

61766989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61766989 is an equidigital number, since it uses as much as digits as its factorization.

61766989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 61766989 is about 7859.1977325933. The cubic root of 61766989 is about 395.2927147185.

The spelling of 61766989 in words is "sixty-one million, seven hundred sixty-six thousand, nine hundred eighty-nine".