420181501 has 2 divisors, whose sum is σ = 420181502. Its totient is φ = 420181500.

The previous prime is 420181499. The next prime is 420181511. The reversal of 420181501 is 105181024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 410872900 + 9308601 = 20270^2 + 3051^2 .

It is a cyclic number.

It is not a de Polignac number, because 420181501 - 2¹ = 420181499 is a prime.

It is a super-2 number, since 2×420181501² = 353104987565226002, which contains 22 as substring.

Together with 420181499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420181511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210090750 + 210090751.

It is an arithmetic number, because the mean of its divisors is an integer number (210090751).

Almost surely, 2^420181501 is an apocalyptic number.

It is an amenable number.

420181501 is a deficient number, since it is larger than the sum of its proper divisors (1).

420181501 is an equidigital number, since it uses as much as digits as its factorization.

420181501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 420181501 is about 20498.3292245978. The cubic root of 420181501 is about 748.9950992042.

The spelling of 420181501 in words is "four hundred twenty million, one hundred eighty-one thousand, five hundred one".