61161649 has 2 divisors, whose sum is σ = 61161650. Its totient is φ = 61161648.

The previous prime is 61161647. The next prime is 61161671. The reversal of 61161649 is 94616116.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32001649 + 29160000 = 5657^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 61161649 - 2¹ = 61161647 is a prime.

Together with 61161647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61161643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30580824 + 30580825.

It is an arithmetic number, because the mean of its divisors is an integer number (30580825).

Almost surely, 2^61161649 is an apocalyptic number.

It is an amenable number.

61161649 is a deficient number, since it is larger than the sum of its proper divisors (1).

61161649 is an equidigital number, since it uses as much as digits as its factorization.

61161649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 61161649 is about 7820.5913459277. The cubic root of 61161649 is about 393.9971333760.

The spelling of 61161649 in words is "sixty-one million, one hundred sixty-one thousand, six hundred forty-nine".