61386749 has 2 divisors, whose sum is σ = 61386750. Its totient is φ = 61386748.

The previous prime is 61386719. The next prime is 61386751. The reversal of 61386749 is 94768316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 4761124 = 7525^2 + 2182^2 .

It is a cyclic number.

It is not a de Polignac number, because 61386749 - 2¹⁶ = 61321213 is a prime.

It is a Sophie Germain prime.

Together with 61386751, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61386719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30693374 + 30693375.

It is an arithmetic number, because the mean of its divisors is an integer number (30693375).

Almost surely, 2^61386749 is an apocalyptic number.

It is an amenable number.

61386749 is a deficient number, since it is larger than the sum of its proper divisors (1).

61386749 is an equidigital number, since it uses as much as digits as its factorization.

61386749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 61386749 is about 7834.9696234255. The cubic root of 61386749 is about 394.4798987168.

The spelling of 61386749 in words is "sixty-one million, three hundred eighty-six thousand, seven hundred forty-nine".