61271687 has 4 divisors (see below), whose sum is σ = 61288416. Its totient is φ = 61254960.

The previous prime is 61271681. The next prime is 61271719. The reversal of 61271687 is 78617216.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61271687 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 61271687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61271681) 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, 239 + ... + 11072.

It is an arithmetic number, because the mean of its divisors is an integer number (15322104).

Almost surely, 2^61271687 is an apocalyptic number.

61271687 is a deficient number, since it is larger than the sum of its proper divisors (16729).

61271687 is a wasteful number, since it uses less digits than its factorization.

61271687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16728.

The product of its digits is 28224, while the sum is 38.

The square root of 61271687 is about 7827.6233302325. The cubic root of 61271687 is about 394.2332763564.

The spelling of 61271687 in words is "sixty-one million, two hundred seventy-one thousand, six hundred eighty-seven".