61534009109 has 2 divisors, whose sum is σ = 61534009110. Its totient is φ = 61534009108.

The previous prime is 61534009093. The next prime is 61534009111. The reversal of 61534009109 is 90190043516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56179428484 + 5354580625 = 237022^2 + 73175^2 .

It is a cyclic number.

It is not a de Polignac number, because 61534009109 - 2⁴ = 61534009093 is a prime.

Together with 61534009111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61534000109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30767004554 + 30767004555.

It is an arithmetic number, because the mean of its divisors is an integer number (30767004555).

Almost surely, 2^61534009109 is an apocalyptic number.

It is an amenable number.

61534009109 is a deficient number, since it is larger than the sum of its proper divisors (1).

61534009109 is an equidigital number, since it uses as much as digits as its factorization.

61534009109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The spelling of 61534009109 in words is "sixty-one billion, five hundred thirty-four million, nine thousand, one hundred nine".