420267161 has 4 divisors (see below), whose sum is σ = 424428324. Its totient is φ = 416106000.

The previous prime is 420267151. The next prime is 420267181. The reversal of 420267161 is 161762024.

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 404814400 + 15452761 = 20120^2 + 3931^2 .

It is a cyclic number.

It is not a de Polignac number, because 420267161 - 2¹⁰ = 420266137 is a prime.

It is a super-2 number, since 2×420267161² = 353248973229999842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420267151) 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, 2080430 + ... + 2080631.

It is an arithmetic number, because the mean of its divisors is an integer number (106107081).

Almost surely, 2^420267161 is an apocalyptic number.

It is an amenable number.

420267161 is a deficient number, since it is larger than the sum of its proper divisors (4161163).

420267161 is a wasteful number, since it uses less digits than its factorization.

420267161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4161162.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 420267161 is about 20500.4185567027. The cubic root of 420267161 is about 749.0459935286.

The spelling of 420267161 in words is "four hundred twenty million, two hundred sixty-seven thousand, one hundred sixty-one".