420402181 has 2 divisors, whose sum is σ = 420402182. Its totient is φ = 420402180.

The previous prime is 420402139. The next prime is 420402223. The reversal of 420402181 is 181204024.

It is a balanced prime because it is at equal distance from previous prime (420402139) and next prime (420402223).

It can be written as a sum of positive squares in only one way, i.e., 375041956 + 45360225 = 19366^2 + 6735^2 .

It is a cyclic number.

It is not a de Polignac number, because 420402181 - 2¹⁹ = 419877893 is a prime.

It is a super-2 number, since 2×420402181² = 353475987579113522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420402121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210201090 + 210201091.

It is an arithmetic number, because the mean of its divisors is an integer number (210201091).

Almost surely, 2^420402181 is an apocalyptic number.

It is an amenable number.

420402181 is a deficient number, since it is larger than the sum of its proper divisors (1).

420402181 is an equidigital number, since it uses as much as digits as its factorization.

420402181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 420402181 is about 20503.7113957449. The cubic root of 420402181 is about 749.1262007322.

The spelling of 420402181 in words is "four hundred twenty million, four hundred two thousand, one hundred eighty-one".