61767649 has 2 divisors, whose sum is σ = 61767650. Its totient is φ = 61767648.

The previous prime is 61767617. The next prime is 61767653. The reversal of 61767649 is 94676716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54287424 + 7480225 = 7368^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 61767649 - 2⁵ = 61767617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61767599 and 61767608.

It is not a weakly prime, because it can be changed into another prime (61768649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30883824 + 30883825.

It is an arithmetic number, because the mean of its divisors is an integer number (30883825).

Almost surely, 2^61767649 is an apocalyptic number.

It is an amenable number.

61767649 is a deficient number, since it is larger than the sum of its proper divisors (1).

61767649 is an equidigital number, since it uses as much as digits as its factorization.

61767649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 46.

The square root of 61767649 is about 7859.2397214998. The cubic root of 61767649 is about 395.2941226564.

The spelling of 61767649 in words is "sixty-one million, seven hundred sixty-seven thousand, six hundred forty-nine".