61061569 has 8 divisors (see below), whose sum is σ = 64738440. Its totient is φ = 57394176.

The previous prime is 61061551. The next prime is 61061579. The reversal of 61061569 is 96516016.

It can be written as a sum of positive squares in 4 ways, for example, as 24010000 + 37051569 = 4900^2 + 6087^2 .

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

It is not a de Polignac number, because 61061569 - 2⁹ = 61061057 is a prime.

It is a super-2 number, since 2×61061569² = 7457030417483522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61061579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14317 + ... + 18085.

It is an arithmetic number, because the mean of its divisors is an integer number (8092305).

Almost surely, 2^61061569 is an apocalyptic number.

It is an amenable number.

61061569 is a deficient number, since it is larger than the sum of its proper divisors (3676871).

61061569 is a wasteful number, since it uses less digits than its factorization.

61061569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 61061569 is about 7814.1902331592. The cubic root of 61061569 is about 393.7821143203.

The spelling of 61061569 in words is "sixty-one million, sixty-one thousand, five hundred sixty-nine".