420691757 has 2 divisors, whose sum is σ = 420691758. Its totient is φ = 420691756.

The previous prime is 420691729. The next prime is 420691759. The reversal of 420691757 is 757196024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317588041 + 103103716 = 17821^2 + 10154^2 .

It is a cyclic number.

It is not a de Polignac number, because 420691757 - 2¹⁴ = 420675373 is a prime.

Together with 420691759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420691759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210345878 + 210345879.

It is an arithmetic number, because the mean of its divisors is an integer number (210345879).

Almost surely, 2^420691757 is an apocalyptic number.

It is an amenable number.

420691757 is a deficient number, since it is larger than the sum of its proper divisors (1).

420691757 is an equidigital number, since it uses as much as digits as its factorization.

420691757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 420691757 is about 20510.7717309710. The cubic root of 420691757 is about 749.2981623998.

The spelling of 420691757 in words is "four hundred twenty million, six hundred ninety-one thousand, seven hundred fifty-seven".