61198187 has 4 divisors (see below), whose sum is σ = 61573800. Its totient is φ = 60822576.

The previous prime is 61198169. The next prime is 61198213. The reversal of 61198187 is 78189116.

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

It is a cyclic number.

It is not a de Polignac number, because 61198187 - 2⁸ = 61197931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61198127) 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, 187562 + ... + 187887.

It is an arithmetic number, because the mean of its divisors is an integer number (15393450).

Almost surely, 2^61198187 is an apocalyptic number.

61198187 is a deficient number, since it is larger than the sum of its proper divisors (375613).

61198187 is a wasteful number, since it uses less digits than its factorization.

61198187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375612.

The product of its digits is 24192, while the sum is 41.

The square root of 61198187 is about 7822.9270097579. The cubic root of 61198187 is about 394.0755757864.

The spelling of 61198187 in words is "sixty-one million, one hundred ninety-eight thousand, one hundred eighty-seven".