61399459 has 4 divisors (see below), whose sum is σ = 66981240. Its totient is φ = 55817680.

The previous prime is 61399453. The next prime is 61399463. The reversal of 61399459 is 95499316.

61399459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61399459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61399453) 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 3 ways as a sum of consecutive naturals, for example, 2790874 + ... + 2790895.

It is an arithmetic number, because the mean of its divisors is an integer number (16745310).

Almost surely, 2^61399459 is an apocalyptic number.

61399459 is a deficient number, since it is larger than the sum of its proper divisors (5581781).

61399459 is a wasteful number, since it uses less digits than its factorization.

61399459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5581780.

The product of its digits is 262440, while the sum is 46.

The square root of 61399459 is about 7835.7806886104. The cubic root of 61399459 is about 394.5071222550.

The spelling of 61399459 in words is "sixty-one million, three hundred ninety-nine thousand, four hundred fifty-nine".