61279561 has 8 divisors (see below), whose sum is σ = 70654464. Its totient is φ = 52059840.

The previous prime is 61279553. The next prime is 61279609. The reversal of 61279561 is 16597216.

61279561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61279561 - 2³ = 61279553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61279561.

It is not an unprimeable number, because it can be changed into a prime (61279531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37945 + ... + 39526.

It is an arithmetic number, because the mean of its divisors is an integer number (8831808).

Almost surely, 2^61279561 is an apocalyptic number.

It is an amenable number.

61279561 is a deficient number, since it is larger than the sum of its proper divisors (9374903).

61279561 is a wasteful number, since it uses less digits than its factorization.

61279561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77591.

The product of its digits is 22680, while the sum is 37.

The square root of 61279561 is about 7828.1262764470. The cubic root of 61279561 is about 394.2501632200.

The spelling of 61279561 in words is "sixty-one million, two hundred seventy-nine thousand, five hundred sixty-one".