61805399 has 2 divisors, whose sum is σ = 61805400. Its totient is φ = 61805398.

The previous prime is 61805389. The next prime is 61805411. The reversal of 61805399 is 99350816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61805399 - 2¹² = 61801303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61805339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30902699 + 30902700.

It is an arithmetic number, because the mean of its divisors is an integer number (30902700).

Almost surely, 2^61805399 is an apocalyptic number.

61805399 is a deficient number, since it is larger than the sum of its proper divisors (1).

61805399 is an equidigital number, since it uses as much as digits as its factorization.

61805399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 61805399 is about 7861.6409864608. The cubic root of 61805399 is about 395.3746357536.

The spelling of 61805399 in words is "sixty-one million, eight hundred five thousand, three hundred ninety-nine".