61399447 has 2 divisors, whose sum is σ = 61399448. Its totient is φ = 61399446.

The previous prime is 61399439. The next prime is 61399453. The reversal of 61399447 is 74499316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61399447 - 2³ = 61399439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61399477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30699723 + 30699724.

It is an arithmetic number, because the mean of its divisors is an integer number (30699724).

Almost surely, 2^61399447 is an apocalyptic number.

61399447 is a deficient number, since it is larger than the sum of its proper divisors (1).

61399447 is an equidigital number, since it uses as much as digits as its factorization.

61399447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The square root of 61399447 is about 7835.7799228922. The cubic root of 61399447 is about 394.5070965540.

The spelling of 61399447 in words is "sixty-one million, three hundred ninety-nine thousand, four hundred forty-seven".