61899829 has 4 divisors (see below), whose sum is σ = 61995276. Its totient is φ = 61804384.

The previous prime is 61899809. The next prime is 61899841. The reversal of 61899829 is 92899816.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5244100 + 56655729 = 2290^2 + 7527^2 .

It is a cyclic number.

It is not a de Polignac number, because 61899829 - 2⁵ = 61899797 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 (61899809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46744 + ... + 48049.

It is an arithmetic number, because the mean of its divisors is an integer number (15498819).

Almost surely, 2^61899829 is an apocalyptic number.

It is an amenable number.

61899829 is a deficient number, since it is larger than the sum of its proper divisors (95447).

61899829 is an equidigital number, since it uses as much as digits as its factorization.

61899829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95446.

The product of its digits is 559872, while the sum is 52.

The square root of 61899829 is about 7867.6444378225. The cubic root of 61899829 is about 395.5758923280.

The spelling of 61899829 in words is "sixty-one million, eight hundred ninety-nine thousand, eight hundred twenty-nine".