61899 has 8 divisors (see below), whose sum is σ = 84480. Its totient is φ = 40296.

The previous prime is 61879. The next prime is 61909. The reversal of 61899 is 99816.

61899 = T₂₆ + T₂₇ + ... + T₇₂.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61899 - 2⁸ = 61643 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79 + ... + 360.

It is an arithmetic number, because the mean of its divisors is an integer number (10560).

2⁶¹⁸⁹⁹ is an apocalyptic number.

61899 is a deficient number, since it is larger than the sum of its proper divisors (22581).

61899 is a wasteful number, since it uses less digits than its factorization.

61899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its digits is 3888, while the sum is 33.

The square root of 61899 is about 248.7950964147. The cubic root of 61899 is about 39.5574126389.

It can be divided in two parts, 618 and 99, that added together give a palindrome (717).

The spelling of 61899 in words is "sixty-one thousand, eight hundred ninety-nine".