471551921 has 2 divisors, whose sum is σ = 471551922. Its totient is φ = 471551920.

The previous prime is 471551917. The next prime is 471551989. The reversal of 471551921 is 129155174.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 465480625 + 6071296 = 21575^2 + 2464^2 .

It is a cyclic number.

It is not a de Polignac number, because 471551921 - 2² = 471551917 is a prime.

It is a super-2 number, since 2×471551921² = 444722428397580482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (471551021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 235775960 + 235775961.

It is an arithmetic number, because the mean of its divisors is an integer number (235775961).

Almost surely, 2^471551921 is an apocalyptic number.

It is an amenable number.

471551921 is a deficient number, since it is larger than the sum of its proper divisors (1).

471551921 is an equidigital number, since it uses as much as digits as its factorization.

471551921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 35.

The square root of 471551921 is about 21715.2462799757. The cubic root of 471551921 is about 778.3528252339.

The spelling of 471551921 in words is "four hundred seventy-one million, five hundred fifty-one thousand, nine hundred twenty-one".