61947999 has 24 divisors (see below), whose sum is σ = 95613440. Its totient is φ = 38533968.

The previous prime is 61947979. The next prime is 61948009. The reversal of 61947999 is 99974916.

61947999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61947999 - 2⁵ = 61947967 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 (61947959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8754 + ... + 14160.

Almost surely, 2^61947999 is an apocalyptic number.

61947999 is a deficient number, since it is larger than the sum of its proper divisors (33665441).

61947999 is a wasteful number, since it uses less digits than its factorization.

61947999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499 (or 5496 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 61947999 is about 7870.7051145371. The cubic root of 61947999 is about 395.6784771567.

The spelling of 61947999 in words is "sixty-one million, nine hundred forty-seven thousand, nine hundred ninety-nine".