61445837 has 4 divisors (see below), whose sum is σ = 65060316. Its totient is φ = 57831360.

The previous prime is 61445831. The next prime is 61445887. The reversal of 61445837 is 73854416.

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 54922921 + 6522916 = 7411^2 + 2554^2 .

It is a cyclic number.

It is not a de Polignac number, because 61445837 - 2⁴ = 61445821 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 61445837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61445831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1807214 + ... + 1807247.

It is an arithmetic number, because the mean of its divisors is an integer number (16265079).

Almost surely, 2^61445837 is an apocalyptic number.

It is an amenable number.

61445837 is a deficient number, since it is larger than the sum of its proper divisors (3614479).

61445837 is a wasteful number, since it uses less digits than its factorization.

61445837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614478.

The product of its digits is 80640, while the sum is 38.

The square root of 61445837 is about 7838.7395032620. The cubic root of 61445837 is about 394.6064273999.

The spelling of 61445837 in words is "sixty-one million, four hundred forty-five thousand, eight hundred thirty-seven".