420551101 has 2 divisors, whose sum is σ = 420551102. Its totient is φ = 420551100.

The previous prime is 420551071. The next prime is 420551107. The reversal of 420551101 is 101155024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420291001 + 260100 = 20501^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 420551101 - 2⁷ = 420550973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420551107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210275550 + 210275551.

It is an arithmetic number, because the mean of its divisors is an integer number (210275551).

Almost surely, 2^420551101 is an apocalyptic number.

It is an amenable number.

420551101 is a deficient number, since it is larger than the sum of its proper divisors (1).

420551101 is an equidigital number, since it uses as much as digits as its factorization.

420551101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 420551101 is about 20507.3426118549. The cubic root of 420551101 is about 749.2146451700.

The spelling of 420551101 in words is "four hundred twenty million, five hundred fifty-one thousand, one hundred one".