61985719 has 2 divisors, whose sum is σ = 61985720. Its totient is φ = 61985718.

The previous prime is 61985659. The next prime is 61985761. The reversal of 61985719 is 91758916.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61985719 - 2⁷ = 61985591 is a prime.

It is a super-2 number, since 2×61985719² = 7684458719893922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61985219) 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, 30992859 + 30992860.

It is an arithmetic number, because the mean of its divisors is an integer number (30992860).

Almost surely, 2^61985719 is an apocalyptic number.

61985719 is a deficient number, since it is larger than the sum of its proper divisors (1).

61985719 is an equidigital number, since it uses as much as digits as its factorization.

61985719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 61985719 is about 7873.1009773786. The cubic root of 61985719 is about 395.7587701130.

The spelling of 61985719 in words is "sixty-one million, nine hundred eighty-five thousand, seven hundred nineteen".