471721979 has 4 divisors (see below), whose sum is σ = 472205784. Its totient is φ = 471238176.

The previous prime is 471721969. The next prime is 471721981. The reversal of 471721979 is 979127174.

It is a happy number.

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-471721979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (471721969) 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, 240437 + ... + 242390.

It is an arithmetic number, because the mean of its divisors is an integer number (118051446).

Almost surely, 2^471721979 is an apocalyptic number.

471721979 is a deficient number, since it is larger than the sum of its proper divisors (483805).

471721979 is an equidigital number, since it uses as much as digits as its factorization.

471721979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483804.

The product of its digits is 222264, while the sum is 47.

The square root of 471721979 is about 21719.1615630070. The cubic root of 471721979 is about 778.4463810088.

The spelling of 471721979 in words is "four hundred seventy-one million, seven hundred twenty-one thousand, nine hundred seventy-nine".