420660101 has 4 divisors (see below), whose sum is σ = 420886092. Its totient is φ = 420434112.

The previous prime is 420660083. The next prime is 420660113. The reversal of 420660101 is 101066024.

It is a happy number.

It is a Cunningham number, because it is equal to 20510²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 263283076 + 157377025 = 16226^2 + 12545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420660101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420660301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110180 + ... + 113933.

It is an arithmetic number, because the mean of its divisors is an integer number (105221523).

Almost surely, 2^420660101 is an apocalyptic number.

It is an amenable number.

420660101 is a deficient number, since it is larger than the sum of its proper divisors (225991).

420660101 is a wasteful number, since it uses less digits than its factorization.

420660101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225990.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 420660101 is about 20510.0000243784. Note that the first 4 decimals coincide. The cubic root of 420660101 is about 749.2793676590.

The spelling of 420660101 in words is "four hundred twenty million, six hundred sixty thousand, one hundred one".