431903261 has 2 divisors, whose sum is σ = 431903262. Its totient is φ = 431903260.

The previous prime is 431903243. The next prime is 431903273. The reversal of 431903261 is 162309134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 356039161 + 75864100 = 18869^2 + 8710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431903261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431903221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215951630 + 215951631.

It is an arithmetic number, because the mean of its divisors is an integer number (215951631).

Almost surely, 2^431903261 is an apocalyptic number.

It is an amenable number.

431903261 is a deficient number, since it is larger than the sum of its proper divisors (1).

431903261 is an equidigital number, since it uses as much as digits as its factorization.

431903261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 431903261 is about 20782.2823818752. The cubic root of 431903261 is about 755.8961981770.

The spelling of 431903261 in words is "four hundred thirty-one million, nine hundred three thousand, two hundred sixty-one".