61269561 has 16 divisors (see below), whose sum is σ = 91238400. Its totient is φ = 40635504.

The previous prime is 61269517. The next prime is 61269563. The reversal of 61269561 is 16596216.

It is not a de Polignac number, because 61269561 - 2⁹ = 61269049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61269563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441 + ... + 11078.

It is an arithmetic number, because the mean of its divisors is an integer number (5702400).

Almost surely, 2^61269561 is an apocalyptic number.

It is an amenable number.

61269561 is a deficient number, since it is larger than the sum of its proper divisors (29968839).

61269561 is a wasteful number, since it uses less digits than its factorization.

61269561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11725 (or 11719 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 61269561 is about 7827.4875279364. The cubic root of 61269561 is about 394.2287166123.

The spelling of 61269561 in words is "sixty-one million, two hundred sixty-nine thousand, five hundred sixty-one".