61198687 has 4 divisors (see below), whose sum is σ = 66762216. Its totient is φ = 55635160.

The previous prime is 61198667. The next prime is 61198717. The reversal of 61198687 is 78689116.

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-61198687 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 (61198667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2781748 + ... + 2781769.

It is an arithmetic number, because the mean of its divisors is an integer number (16690554).

Almost surely, 2^61198687 is an apocalyptic number.

61198687 is a deficient number, since it is larger than the sum of its proper divisors (5563529).

61198687 is a wasteful number, since it uses less digits than its factorization.

61198687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563528.

The product of its digits is 145152, while the sum is 46.

The square root of 61198687 is about 7822.9589670405. The cubic root of 61198687 is about 394.0766490059.

The spelling of 61198687 in words is "sixty-one million, one hundred ninety-eight thousand, six hundred eighty-seven".