61691198 has 16 divisors (see below), whose sum is σ = 102241440. Its totient is φ = 27768576.

The previous prime is 61691159. The next prime is 61691219. The reversal of 61691198 is 89119616.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38663 + ... + 40226.

It is an arithmetic number, because the mean of its divisors is an integer number (6390090).

Almost surely, 2^61691198 is an apocalyptic number.

61691198 is a deficient number, since it is larger than the sum of its proper divisors (40550242).

61691198 is a wasteful number, since it uses less digits than its factorization.

61691198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78931.

The product of its digits is 23328, while the sum is 41.

The square root of 61691198 is about 7854.3744499483. The cubic root of 61691198 is about 395.1309676270.

The spelling of 61691198 in words is "sixty-one million, six hundred ninety-one thousand, one hundred ninety-eight".