61647971 has 8 divisors (see below), whose sum is σ = 76859904. Its totient is φ = 48037320.

The previous prime is 61647961. The next prime is 61647983. The reversal of 61647971 is 17974616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61647971 - 2⁶ = 61647907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61647931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400235 + ... + 400388.

It is an arithmetic number, because the mean of its divisors is an integer number (9607488).

Almost surely, 2^61647971 is an apocalyptic number.

61647971 is a deficient number, since it is larger than the sum of its proper divisors (15211933).

61647971 is a wasteful number, since it uses less digits than its factorization.

61647971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800641.

The product of its digits is 63504, while the sum is 41.

The square root of 61647971 is about 7851.6221890766. The cubic root of 61647971 is about 395.0386566878.

The spelling of 61647971 in words is "sixty-one million, six hundred forty-seven thousand, nine hundred seventy-one".