61569245 has 8 divisors (see below), whose sum is σ = 74083416. Its totient is φ = 49121856.

The previous prime is 61569239. The next prime is 61569259. The reversal of 61569245 is 54296516.

It can be written as a sum of positive squares in 4 ways, for example, as 1692601 + 59876644 = 1301^2 + 7738^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61569245 - 2¹⁶ = 61503709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61569199 and 61569208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14642 + ... + 18371.

It is an arithmetic number, because the mean of its divisors is an integer number (9260427).

Almost surely, 2^61569245 is an apocalyptic number.

It is an amenable number.

61569245 is a deficient number, since it is larger than the sum of its proper divisors (12514171).

61569245 is a wasteful number, since it uses less digits than its factorization.

61569245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33391.

The product of its digits is 64800, while the sum is 38.

The square root of 61569245 is about 7846.6072286052. The cubic root of 61569245 is about 394.8704269765.

The spelling of 61569245 in words is "sixty-one million, five hundred sixty-nine thousand, two hundred forty-five".