61859999 has 4 divisors (see below), whose sum is σ = 62130360. Its totient is φ = 61589640.

The previous prime is 61859971. The next prime is 61860013. The reversal of 61859999 is 99995816.

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 61859999 - 2¹² = 61855903 is a prime.

It is a Duffinian number.

61859999 is a modest number, since divided by 9999 gives 6185 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61859909) 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, 134837 + ... + 135294.

It is an arithmetic number, because the mean of its divisors is an integer number (15532590).

Almost surely, 2^61859999 is an apocalyptic number.

61859999 is a deficient number, since it is larger than the sum of its proper divisors (270361).

61859999 is a wasteful number, since it uses less digits than its factorization.

61859999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270360.

The product of its digits is 1574640, while the sum is 56.

The square root of 61859999 is about 7865.1127773224. The cubic root of 61859999 is about 395.4910285049.

The spelling of 61859999 in words is "sixty-one million, eight hundred fifty-nine thousand, nine hundred ninety-nine".