61909198 has 16 divisors (see below), whose sum is σ = 100800000. Its totient is φ = 28346976.

The previous prime is 61909157. The next prime is 61909217. The reversal of 61909198 is 89190916.

61909198 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6073 + ... + 12676.

It is an arithmetic number, because the mean of its divisors is an integer number (6300000).

Almost surely, 2^61909198 is an apocalyptic number.

61909198 is a deficient number, since it is larger than the sum of its proper divisors (38890802).

61909198 is a wasteful number, since it uses less digits than its factorization.

61909198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18891.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 61909198 is about 7868.2398285767. The cubic root of 61909198 is about 395.5958491067.

The spelling of 61909198 in words is "sixty-one million, nine hundred nine thousand, one hundred ninety-eight".