61118399 has 4 divisors (see below), whose sum is σ = 63225960. Its totient is φ = 59010840.

The previous prime is 61118389. The next prime is 61118411. The reversal of 61118399 is 99381116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61118399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61118389) 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 in 3 ways as a sum of consecutive naturals, for example, 1053737 + ... + 1053794.

It is an arithmetic number, because the mean of its divisors is an integer number (15806490).

Almost surely, 2^61118399 is an apocalyptic number.

61118399 is a deficient number, since it is larger than the sum of its proper divisors (2107561).

61118399 is a wasteful number, since it uses less digits than its factorization.

61118399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107560.

The product of its digits is 11664, while the sum is 38.

The square root of 61118399 is about 7817.8257207487. The cubic root of 61118399 is about 393.9042407735.

The spelling of 61118399 in words is "sixty-one million, one hundred eighteen thousand, three hundred ninety-nine".