420492109 has 2 divisors, whose sum is σ = 420492110. Its totient is φ = 420492108.

The previous prime is 420492101. The next prime is 420492113. The reversal of 420492109 is 901294024.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236482884 + 184009225 = 15378^2 + 13565^2 .

It is a cyclic number.

It is not a de Polignac number, because 420492109 - 2³ = 420492101 is a prime.

It is a super-2 number, since 2×420492109² = 353627227462535762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420492101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210246054 + 210246055.

It is an arithmetic number, because the mean of its divisors is an integer number (210246055).

Almost surely, 2^420492109 is an apocalyptic number.

It is an amenable number.

420492109 is a deficient number, since it is larger than the sum of its proper divisors (1).

420492109 is an equidigital number, since it uses as much as digits as its factorization.

420492109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 420492109 is about 20505.9042473137. The cubic root of 420492109 is about 749.1796119822.

The spelling of 420492109 in words is "four hundred twenty million, four hundred ninety-two thousand, one hundred nine".