61838999 has 2 divisors, whose sum is σ = 61839000. Its totient is φ = 61838998.

The previous prime is 61838993. The next prime is 61839059. The reversal of 61838999 is 99983816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61838999 - 2⁴ = 61838983 is a prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 61838999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61838993) 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, 30919499 + 30919500.

It is an arithmetic number, because the mean of its divisors is an integer number (30919500).

Almost surely, 2^61838999 is an apocalyptic number.

61838999 is a deficient number, since it is larger than the sum of its proper divisors (1).

61838999 is an equidigital number, since it uses as much as digits as its factorization.

61838999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 53.

The square root of 61838999 is about 7863.7776545373. Note that the first 3 decimals coincide. The cubic root of 61838999 is about 395.4462701704.

The spelling of 61838999 in words is "sixty-one million, eight hundred thirty-eight thousand, nine hundred ninety-nine".