61345561 has 8 divisors (see below), whose sum is σ = 62130240. Its totient is φ = 60565008.

The previous prime is 61345511. The next prime is 61345573. The reversal of 61345561 is 16554316.

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 61345561 - 2¹³ = 61337369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61345511) 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, 37615 + ... + 39211.

It is an arithmetic number, because the mean of its divisors is an integer number (7766280).

Almost surely, 2^61345561 is an apocalyptic number.

It is an amenable number.

61345561 is a deficient number, since it is larger than the sum of its proper divisors (784679).

61345561 is a wasteful number, since it uses less digits than its factorization.

61345561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063.

The product of its digits is 10800, while the sum is 31.

The square root of 61345561 is about 7832.3407101581. The cubic root of 61345561 is about 394.3916523467.

Adding to 61345561 its reverse (16554316), we get a palindrome (77899877).

The spelling of 61345561 in words is "sixty-one million, three hundred forty-five thousand, five hundred sixty-one".