61445537 has 4 divisors (see below), whose sum is σ = 61470276. Its totient is φ = 61420800.

The previous prime is 61445473. The next prime is 61445539. The reversal of 61445537 is 73554416.

61445537 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 19855936 + 41589601 = 4456^2 + 6449^2 .

It is a cyclic number.

It is not a de Polignac number, because 61445537 - 2⁶ = 61445473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61445497 and 61445506.

It is not an unprimeable number, because it can be changed into a prime (61445539) 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 3 ways as a sum of consecutive naturals, for example, 8168 + ... + 13769.

It is an arithmetic number, because the mean of its divisors is an integer number (15367569).

Almost surely, 2^61445537 is an apocalyptic number.

It is an amenable number.

61445537 is a deficient number, since it is larger than the sum of its proper divisors (24739).

61445537 is a wasteful number, since it uses less digits than its factorization.

61445537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24738.

The product of its digits is 50400, while the sum is 35.

The square root of 61445537 is about 7838.7203675090. The cubic root of 61445537 is about 394.6057851968.

The spelling of 61445537 in words is "sixty-one million, four hundred forty-five thousand, five hundred thirty-seven".