61085987 has 2 divisors, whose sum is σ = 61085988. Its totient is φ = 61085986.

The previous prime is 61085963. The next prime is 61085989. The reversal of 61085987 is 78958016.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61085987 - 2²² = 56891683 is a prime.

Together with 61085989, 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 (61085989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30542993 + 30542994.

It is an arithmetic number, because the mean of its divisors is an integer number (30542994).

Almost surely, 2^61085987 is an apocalyptic number.

61085987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61085987 is an equidigital number, since it uses as much as digits as its factorization.

61085987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 61085987 is about 7815.7524909634. The cubic root of 61085987 is about 393.8345973600.

The spelling of 61085987 in words is "sixty-one million, eighty-five thousand, nine hundred eighty-seven".