61191998 has 16 divisors (see below), whose sum is σ = 106881120. Its totient is φ = 25730016.

The previous prime is 61191997. The next prime is 61192013. The reversal of 61191998 is 89919116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61191997) 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 7 ways as a sum of consecutive naturals, for example, 40493 + ... + 41976.

It is an arithmetic number, because the mean of its divisors is an integer number (6680070).

Almost surely, 2^61191998 is an apocalyptic number.

61191998 is a deficient number, since it is larger than the sum of its proper divisors (45689122).

61191998 is a wasteful number, since it uses less digits than its factorization.

61191998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82531.

The product of its digits is 34992, while the sum is 44.

The square root of 61191998 is about 7822.5314317042. The cubic root of 61191998 is about 394.0622909922.

The spelling of 61191998 in words is "sixty-one million, one hundred ninety-one thousand, nine hundred ninety-eight".