61995899 has 4 divisors (see below), whose sum is σ = 70852464. Its totient is φ = 53139336.

The previous prime is 61995893. The next prime is 61995931. The reversal of 61995899 is 99859916.

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 61995899 - 2⁸ = 61995643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61995893) 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, 4428272 + ... + 4428285.

It is an arithmetic number, because the mean of its divisors is an integer number (17713116).

Almost surely, 2^61995899 is an apocalyptic number.

61995899 is a deficient number, since it is larger than the sum of its proper divisors (8856565).

61995899 is an equidigital number, since it uses as much as digits as its factorization.

61995899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8856564.

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

The square root of 61995899 is about 7873.7474559450. The cubic root of 61995899 is about 395.7804342630.

The spelling of 61995899 in words is "sixty-one million, nine hundred ninety-five thousand, eight hundred ninety-nine".