61187239 has 4 divisors (see below), whose sum is σ = 64407640. Its totient is φ = 57966840.

The previous prime is 61187221. The next prime is 61187263. The reversal of 61187239 is 93278116.

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 61187239 - 2⁵ = 61187207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61187198 and 61187207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61187299) 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, 1610172 + ... + 1610209.

It is an arithmetic number, because the mean of its divisors is an integer number (16101910).

Almost surely, 2^61187239 is an apocalyptic number.

61187239 is a deficient number, since it is larger than the sum of its proper divisors (3220401).

61187239 is a wasteful number, since it uses less digits than its factorization.

61187239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220400.

The product of its digits is 18144, while the sum is 37.

The square root of 61187239 is about 7822.2272403709. The cubic root of 61187239 is about 394.0520751082.

The spelling of 61187239 in words is "sixty-one million, one hundred eighty-seven thousand, two hundred thirty-nine".