431665601 has 2 divisors, whose sum is σ = 431665602. Its totient is φ = 431665600.

The previous prime is 431665583. The next prime is 431665603. The reversal of 431665601 is 106566134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287641600 + 144024001 = 16960^2 + 12001^2 .

It is a cyclic number.

It is not a de Polignac number, because 431665601 - 2¹⁰ = 431664577 is a prime.

Together with 431665603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (431665603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215832800 + 215832801.

It is an arithmetic number, because the mean of its divisors is an integer number (215832801).

Almost surely, 2^431665601 is an apocalyptic number.

It is an amenable number.

431665601 is a deficient number, since it is larger than the sum of its proper divisors (1).

431665601 is an equidigital number, since it uses as much as digits as its factorization.

431665601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 431665601 is about 20776.5637437956. The cubic root of 431665601 is about 755.7575257260.

The spelling of 431665601 in words is "four hundred thirty-one million, six hundred sixty-five thousand, six hundred one".