61125649 has 16 divisors (see below), whose sum is σ = 68458320. Its totient is φ = 54190080.

The previous prime is 61125637. The next prime is 61125703. The reversal of 61125649 is 94652116.

It can be written as a sum of positive squares in 8 ways, for example, as 3972049 + 57153600 = 1993^2 + 7560^2 .

It is a cyclic number.

It is not a de Polignac number, because 61125649 - 2¹⁵ = 61092881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61125049) 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 in 15 ways as a sum of consecutive naturals, for example, 105649 + ... + 106225.

It is an arithmetic number, because the mean of its divisors is an integer number (4278645).

Almost surely, 2^61125649 is an apocalyptic number.

It is an amenable number.

61125649 is a deficient number, since it is larger than the sum of its proper divisors (7332671).

61125649 is a wasteful number, since it uses less digits than its factorization.

61125649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900.

The product of its digits is 12960, while the sum is 34.

The square root of 61125649 is about 7818.2893909090. The cubic root of 61125649 is about 393.9198154225.

The spelling of 61125649 in words is "sixty-one million, one hundred twenty-five thousand, six hundred forty-nine".