475739021 has 2 divisors, whose sum is σ = 475739022. Its totient is φ = 475739020.

The previous prime is 475739003. The next prime is 475739023. The reversal of 475739021 is 120937574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 345550921 + 130188100 = 18589^2 + 11410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-475739021 is a prime.

It is a super-2 number, since 2×475739021² = 452655232204076882, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 475739023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (475739023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237869510 + 237869511.

It is an arithmetic number, because the mean of its divisors is an integer number (237869511).

Almost surely, 2^475739021 is an apocalyptic number.

It is an amenable number.

475739021 is a deficient number, since it is larger than the sum of its proper divisors (1).

475739021 is an equidigital number, since it uses as much as digits as its factorization.

475739021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 475739021 is about 21811.4424328149. The cubic root of 475739021 is about 780.6498096945.

The spelling of 475739021 in words is "four hundred seventy-five million, seven hundred thirty-nine thousand, twenty-one".