61043909249 has 2 divisors, whose sum is σ = 61043909250. Its totient is φ = 61043909248.

The previous prime is 61043909237. The next prime is 61043909257. The reversal of 61043909249 is 94290934016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38393659249 + 22650250000 = 195943^2 + 150500^2 .

It is a cyclic number.

It is not a de Polignac number, because 61043909249 - 2⁴ = 61043909233 is a prime.

It is not a weakly prime, because it can be changed into another prime (61043909209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30521954624 + 30521954625.

It is an arithmetic number, because the mean of its divisors is an integer number (30521954625).

Almost surely, 2^61043909249 is an apocalyptic number.

It is an amenable number.

61043909249 is a deficient number, since it is larger than the sum of its proper divisors (1).

61043909249 is an equidigital number, since it uses as much as digits as its factorization.

61043909249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 61043909249 in words is "sixty-one billion, forty-three million, nine hundred nine thousand, two hundred forty-nine".