61198815 has 16 divisors (see below), whose sum is σ = 98463456. Its totient is φ = 32457600.

The previous prime is 61198771. The next prime is 61198831. The reversal of 61198815 is 51889116.

It is not a de Polignac number, because 61198815 - 2⁶ = 61198751 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8556 + ... + 13985.

It is an arithmetic number, because the mean of its divisors is an integer number (6153966).

Almost surely, 2^61198815 is an apocalyptic number.

61198815 is a deficient number, since it is larger than the sum of its proper divisors (37264641).

61198815 is a wasteful number, since it uses less digits than its factorization.

61198815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22730.

The product of its digits is 17280, while the sum is 39.

The square root of 61198815 is about 7822.9671480839. The cubic root of 61198815 is about 394.0769237491.

The spelling of 61198815 in words is "sixty-one million, one hundred ninety-eight thousand, eight hundred fifteen".