61198009 has 4 divisors (see below), whose sum is σ = 63858816. Its totient is φ = 58537204.

The previous prime is 61198003. The next prime is 61198043. The reversal of 61198009 is 90089116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61198009 - 2¹¹ = 61195961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61198003) 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, 1330369 + ... + 1330414.

It is an arithmetic number, because the mean of its divisors is an integer number (15964704).

Almost surely, 2^61198009 is an apocalyptic number.

It is an amenable number.

61198009 is a deficient number, since it is larger than the sum of its proper divisors (2660807).

61198009 is a wasteful number, since it uses less digits than its factorization.

61198009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660806.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 61198009 is about 7822.9156329338. The cubic root of 61198009 is about 394.0751937189.

The spelling of 61198009 in words is "sixty-one million, one hundred ninety-eight thousand, nine".