61864199 has 4 divisors (see below), whose sum is σ = 61960464. Its totient is φ = 61767936.

The previous prime is 61864177. The next prime is 61864237. The reversal of 61864199 is 99146816.

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 61864199 - 2²⁴ = 45086983 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 (61864109) 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, 47162 + ... + 48455.

It is an arithmetic number, because the mean of its divisors is an integer number (15490116).

Almost surely, 2^61864199 is an apocalyptic number.

61864199 is a deficient number, since it is larger than the sum of its proper divisors (96265).

61864199 is an equidigital number, since it uses as much as digits as its factorization.

61864199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96264.

The product of its digits is 93312, while the sum is 44.

The square root of 61864199 is about 7865.3797746835. The cubic root of 61864199 is about 395.4999789563.

The spelling of 61864199 in words is "sixty-one million, eight hundred sixty-four thousand, one hundred ninety-nine".