61399549 has 2 divisors, whose sum is σ = 61399550. Its totient is φ = 61399548.

The previous prime is 61399517. The next prime is 61399553. The reversal of 61399549 is 94599316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50310649 + 11088900 = 7093^2 + 3330^2 .

It is a cyclic number.

It is not a de Polignac number, because 61399549 - 2⁵ = 61399517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61399499 and 61399508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61399579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30699774 + 30699775.

It is an arithmetic number, because the mean of its divisors is an integer number (30699775).

Almost surely, 2^61399549 is an apocalyptic number.

It is an amenable number.

61399549 is a deficient number, since it is larger than the sum of its proper divisors (1).

61399549 is an equidigital number, since it uses as much as digits as its factorization.

61399549 is an evil number, because the sum of its binary digits is even.

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

The square root of 61399549 is about 7835.7864314949. The cubic root of 61399549 is about 394.5073150125.

The spelling of 61399549 in words is "sixty-one million, three hundred ninety-nine thousand, five hundred forty-nine".