420154261 has 2 divisors, whose sum is σ = 420154262. Its totient is φ = 420154260.

The previous prime is 420154199. The next prime is 420154279. The reversal of 420154261 is 162451024.

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., 395254161 + 24900100 = 19881^2 + 4990^2 .

It is a cyclic number.

It is not a de Polignac number, because 420154261 - 2⁹ = 420153749 is a prime.

It is a super-2 number, since 2×420154261² = 353059206072912242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420154661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210077130 + 210077131.

It is an arithmetic number, because the mean of its divisors is an integer number (210077131).

Almost surely, 2^420154261 is an apocalyptic number.

It is an amenable number.

420154261 is a deficient number, since it is larger than the sum of its proper divisors (1).

420154261 is an equidigital number, since it uses as much as digits as its factorization.

420154261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 420154261 is about 20497.6647694317. The cubic root of 420154261 is about 748.9789132883.

The spelling of 420154261 in words is "four hundred twenty million, one hundred fifty-four thousand, two hundred sixty-one".