61399727 has 2 divisors, whose sum is σ = 61399728. Its totient is φ = 61399726.

The previous prime is 61399711. The next prime is 61399799. The reversal of 61399727 is 72799316.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61399727 - 2⁴ = 61399711 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61390727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30699863 + 30699864.

It is an arithmetic number, because the mean of its divisors is an integer number (30699864).

Almost surely, 2^61399727 is an apocalyptic number.

61399727 is a deficient number, since it is larger than the sum of its proper divisors (1).

61399727 is an equidigital number, since it uses as much as digits as its factorization.

61399727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 44.

The square root of 61399727 is about 7835.7977896319. The cubic root of 61399727 is about 394.5076962435.

It can be divided in two parts, 61399 and 727, that added together give a palindrome (62126).

The spelling of 61399727 in words is "sixty-one million, three hundred ninety-nine thousand, seven hundred twenty-seven".