61399799 has 2 divisors, whose sum is σ = 61399800. Its totient is φ = 61399798.

The previous prime is 61399727. The next prime is 61399823. The reversal of 61399799 is 99799316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61399799 - 2¹⁶ = 61334263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61399799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61399199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30699899 + 30699900.

It is an arithmetic number, because the mean of its divisors is an integer number (30699900).

Almost surely, 2^61399799 is an apocalyptic number.

61399799 is a deficient number, since it is larger than the sum of its proper divisors (1).

61399799 is an equidigital number, since it uses as much as digits as its factorization.

61399799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826686, while the sum is 53.

The square root of 61399799 is about 7835.8023839298. The cubic root of 61399799 is about 394.5078504491.

The spelling of 61399799 in words is "sixty-one million, three hundred ninety-nine thousand, seven hundred ninety-nine".