61819 has 2 divisors, whose sum is σ = 61820. Its totient is φ = 61818.

The previous prime is 61813. The next prime is 61837. The reversal of 61819 is 91816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61819 - 2¹¹ = 59771 is a prime.

It is a super-2 number, since 2×61819² = 7643177522, which contains 22 as substring.

61819 is a strobogrammatic number because it is the same when read upside-down.

It is a junction number, because it is equal to n+sod(n) for n = 61793 and 61802.

It is not a weakly prime, because it can be changed into another prime (61813) 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, 30909 + 30910.

It is an arithmetic number, because the mean of its divisors is an integer number (30910).

2⁶¹⁸¹⁹ is an apocalyptic number.

61819 is a deficient number, since it is larger than the sum of its proper divisors (1).

61819 is an equidigital number, since it uses as much as digits as its factorization.

61819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 25.

The square root of 61819 is about 248.6342695607. The cubic root of 61819 is about 39.5403635895.

The spelling of 61819 in words is "sixty-one thousand, eight hundred nineteen".