61310545 has 4 divisors (see below), whose sum is σ = 73572660. Its totient is φ = 49048432.

The previous prime is 61310531. The next prime is 61310569. The reversal of 61310545 is 54501316.

61310545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 35331136 + 25979409 = 5944^2 + 5097^2 .

It is a cyclic number.

It is not a de Polignac number, because 61310545 - 2²¹ = 59213393 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6131050 + ... + 6131059.

It is an arithmetic number, because the mean of its divisors is an integer number (18393165).

Almost surely, 2^61310545 is an apocalyptic number.

It is an amenable number.

61310545 is a deficient number, since it is larger than the sum of its proper divisors (12262115).

61310545 is a wasteful number, since it uses less digits than its factorization.

61310545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12262114.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 61310545 is about 7830.1050439953. The cubic root of 61310545 is about 394.3165985787.

The spelling of 61310545 in words is "sixty-one million, three hundred ten thousand, five hundred forty-five".