61138199 has 4 divisors (see below), whose sum is σ = 61504464. Its totient is φ = 60771936.

The previous prime is 61138193. The next prime is 61138241. The reversal of 61138199 is 99183116.

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 61138199 - 2⁴ = 61138183 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 (61138193) 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, 182882 + ... + 183215.

It is an arithmetic number, because the mean of its divisors is an integer number (15376116).

Almost surely, 2^61138199 is an apocalyptic number.

61138199 is a deficient number, since it is larger than the sum of its proper divisors (366265).

61138199 is a wasteful number, since it uses less digits than its factorization.

61138199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366264.

The product of its digits is 11664, while the sum is 38.

The square root of 61138199 is about 7819.0919549523. The cubic root of 61138199 is about 393.9467727662.

The spelling of 61138199 in words is "sixty-one million, one hundred thirty-eight thousand, one hundred ninety-nine".