61689771 has 24 divisors (see below), whose sum is σ = 104687856. Its totient is φ = 34511040.

The previous prime is 61689763. The next prime is 61689809. The reversal of 61689771 is 17798616.

It is not a de Polignac number, because 61689771 - 2³ = 61689763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61689701) 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 23 ways as a sum of consecutive naturals, for example, 22680 + ... + 25253.

It is an arithmetic number, because the mean of its divisors is an integer number (4361994).

Almost surely, 2^61689771 is an apocalyptic number.

61689771 is a deficient number, since it is larger than the sum of its proper divisors (42998085).

61689771 is a wasteful number, since it uses less digits than its factorization.

61689771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47963 (or 47960 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 61689771 is about 7854.2836083248. The cubic root of 61689771 is about 395.1279209674.

The spelling of 61689771 in words is "sixty-one million, six hundred eighty-nine thousand, seven hundred seventy-one".