61766987 has 2 divisors, whose sum is σ = 61766988. Its totient is φ = 61766986.

The previous prime is 61766959. The next prime is 61766989. The reversal of 61766987 is 78966716.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61766987 is a prime.

Together with 61766989, 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 (61766989) 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, 30883493 + 30883494.

It is an arithmetic number, because the mean of its divisors is an integer number (30883494).

Almost surely, 2^61766987 is an apocalyptic number.

61766987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61766987 is an equidigital number, since it uses as much as digits as its factorization.

61766987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The square root of 61766987 is about 7859.1976053539. The cubic root of 61766987 is about 395.2927104520.

The spelling of 61766987 in words is "sixty-one million, seven hundred sixty-six thousand, nine hundred eighty-seven".