61864599 has 4 divisors (see below), whose sum is σ = 82486136. Its totient is φ = 41243064.

The previous prime is 61864597. The next prime is 61864603. The reversal of 61864599 is 99546816.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61864599 - 2¹ = 61864597 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 (61864597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10310764 + ... + 10310769.

It is an arithmetic number, because the mean of its divisors is an integer number (20621534).

Almost surely, 2^61864599 is an apocalyptic number.

61864599 is a deficient number, since it is larger than the sum of its proper divisors (20621537).

61864599 is a wasteful number, since it uses less digits than its factorization.

61864599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20621536.

The product of its digits is 466560, while the sum is 48.

The square root of 61864599 is about 7865.4052025309. The cubic root of 61864599 is about 395.5008313591.

The spelling of 61864599 in words is "sixty-one million, eight hundred sixty-four thousand, five hundred ninety-nine".