61445239 has 4 divisors (see below), whose sum is σ = 62452600. Its totient is φ = 60437880.

The previous prime is 61445233. The next prime is 61445261. The reversal of 61445239 is 93254416.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61445239 - 2⁵ = 61445207 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 (61445233) 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, 503589 + ... + 503710.

It is an arithmetic number, because the mean of its divisors is an integer number (15613150).

Almost surely, 2^61445239 is an apocalyptic number.

61445239 is a deficient number, since it is larger than the sum of its proper divisors (1007361).

61445239 is a wasteful number, since it uses less digits than its factorization.

61445239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007360.

The product of its digits is 25920, while the sum is 34.

The square root of 61445239 is about 7838.7013592814. The cubic root of 61445239 is about 394.6051472729.

The spelling of 61445239 in words is "sixty-one million, four hundred forty-five thousand, two hundred thirty-nine".