61545461 has 4 divisors (see below), whose sum is σ = 62154924. Its totient is φ = 60936000.

The previous prime is 61545439. The next prime is 61545481. The reversal of 61545461 is 16454516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60357361 + 1188100 = 7769^2 + 1090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61545461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61545481) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 304580 + ... + 304781.

It is an arithmetic number, because the mean of its divisors is an integer number (15538731).

Almost surely, 2^61545461 is an apocalyptic number.

It is an amenable number.

61545461 is a deficient number, since it is larger than the sum of its proper divisors (609463).

61545461 is a wasteful number, since it uses less digits than its factorization.

61545461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609462.

The product of its digits is 14400, while the sum is 32.

The square root of 61545461 is about 7845.0915227294. The cubic root of 61545461 is about 394.8195747054.

Adding to 61545461 its reverse (16454516), we get a palindrome (77999977).

The spelling of 61545461 in words is "sixty-one million, five hundred forty-five thousand, four hundred sixty-one".