61839109 has 2 divisors, whose sum is σ = 61839110. Its totient is φ = 61839108.

The previous prime is 61839101. The next prime is 61839119. The reversal of 61839109 is 90193816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58094884 + 3744225 = 7622^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 61839109 - 2³ = 61839101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61839101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30919554 + 30919555.

It is an arithmetic number, because the mean of its divisors is an integer number (30919555).

Almost surely, 2^61839109 is an apocalyptic number.

It is an amenable number.

61839109 is a deficient number, since it is larger than the sum of its proper divisors (1).

61839109 is an equidigital number, since it uses as much as digits as its factorization.

61839109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 61839109 is about 7863.7846486282. The cubic root of 61839109 is about 395.4465046452.

The spelling of 61839109 in words is "sixty-one million, eight hundred thirty-nine thousand, one hundred nine".