61539437 has 6 divisors (see below), whose sum is σ = 62296782. Its totient is φ = 60791192.

The previous prime is 61539431. The next prime is 61539449. The reversal of 61539437 is 73493516.

It is a happy number.

61539437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 46321636 + 15217801 = 6806^2 + 3901^2 .

It is not a de Polignac number, because 61539437 - 2¹⁰ = 61538413 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 61539437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61539431) 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 5 ways as a sum of consecutive naturals, for example, 2423 + ... + 11355.

It is an arithmetic number, because the mean of its divisors is an integer number (10382797).

Almost surely, 2^61539437 is an apocalyptic number.

It is an amenable number.

61539437 is a deficient number, since it is larger than the sum of its proper divisors (757345).

61539437 is an frugal number, since it uses more digits than its factorization.

61539437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9099 (or 9016 counting only the distinct ones).

The product of its digits is 68040, while the sum is 38.

The square root of 61539437 is about 7844.7075789987. The cubic root of 61539437 is about 394.8066927875.

The spelling of 61539437 in words is "sixty-one million, five hundred thirty-nine thousand, four hundred thirty-seven".