61144437 has 4 divisors (see below), whose sum is σ = 81525920. Its totient is φ = 40762956.

The previous prime is 61144429. The next prime is 61144439. The reversal of 61144437 is 73444116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61144437 - 2³ = 61144429 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 (61144439) 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, 10190737 + ... + 10190742.

It is an arithmetic number, because the mean of its divisors is an integer number (20381480).

Almost surely, 2^61144437 is an apocalyptic number.

It is an amenable number.

61144437 is a deficient number, since it is larger than the sum of its proper divisors (20381483).

61144437 is a wasteful number, since it uses less digits than its factorization.

61144437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20381482.

The product of its digits is 8064, while the sum is 30.

The square root of 61144437 is about 7819.4908402018. The cubic root of 61144437 is about 393.9601705896.

The spelling of 61144437 in words is "sixty-one million, one hundred forty-four thousand, four hundred thirty-seven".