61838243099 has 2 divisors, whose sum is σ = 61838243100. Its totient is φ = 61838243098.

The previous prime is 61838243083. The next prime is 61838243101. The reversal of 61838243099 is 99034283816.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61838243099 - 2⁴ = 61838243083 is a prime.

It is a super-2 number, since 2×61838243099² (a number of 22 digits) contains 22 as substring.

Together with 61838243101, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61838243099.

It is not a weakly prime, because it can be changed into another prime (61838243009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30919121549 + 30919121550.

It is an arithmetic number, because the mean of its divisors is an integer number (30919121550).

Almost surely, 2^61838243099 is an apocalyptic number.

61838243099 is a deficient number, since it is larger than the sum of its proper divisors (1).

61838243099 is an equidigital number, since it uses as much as digits as its factorization.

61838243099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 61838243099 in words is "sixty-one billion, eight hundred thirty-eight million, two hundred forty-three thousand, ninety-nine".